
1) Arm muscle 2) Chin-up muscle 3) Curl muscle 4) Curl performer 5) Curling performer 6) Flexor of note 7) Gun is slang for it 8) Gun show highlight 9) It may be flexed for effect 10) Muscle magazine subject 11) Muscle near the humerus 12) Muscles on top of the arm 13) Oft-displayed muscle 14) Pull-up assister
Found on
https://www.crosswordclues.com/clue/bicep

The large muscle at the front of the upper arm that is used to bend the elbow.
Found on
http://www.encyclo.co.uk/local/20560

the muscle running along the inside of the upper arm which bends your arm at the elbow. Paddling a canoe (and a kayak, to some degree) exercises your biceps.
Found on
http://www.encyclo.co.uk/local/20944
No exact match found.