
1) Clutching one 2) One with a tight hold
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https://www.crosswordclues.com/clue/clasper

In biology, a clasper is a male anatomical structure found in some groups of animals, used in mating. Male cartilaginous fish have claspers formed from the posterior portion of their pelvic fin which serve as intromittent organs used to channel semen into the female`s cloaca during mating. The act of mating in some fish including sharks usually i....
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http://en.wikipedia.org/wiki/Clasper
[mathematics] In the mathematical field of low-dimensional topology, a clasper is a surface (with extra structure) in a 3-manifold on which surgery can be performed. == Motivation == Beginning with the Jones polynomial, infinitely many new invariants of knots, links, and 3-manifolds were found during the 1980s. The study of these new `quant...
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http://en.wikipedia.org/wiki/Clasper_(mathematics)

• (n.) One of a pair of male copulatory organs, developed on the anterior side of the ventral fins of sharks and other elasmobranchs. See Illust. of Chimaera. • (n.) One who, or that which, clasps, as a tendril. • (n.) One of a pair of organs used by the male for grasping the female among many of the Crustacea.Clasper: words in the d...
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http://thinkexist.com/dictionary/meaning/clasper/
Clasp'er noun 1. One who, or that which, clasps, as a tendril. 'The
claspers of vines.'
Derham. 2. (Zoology) (a) One of a pair of organs used by the male for grasping the female among many of the Crustacea.
(b) One of a pair of male copulatory org...
Found on
http://www.encyclo.co.uk/webster/C/87

a person or thing that clasps. · (in insects, fishes, crustaceans, etc.) one of the modified, usually paired organs or parts by which the male clasps the female during copulation.
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https://www.infoplease.com/dictionary/clasper
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