
1) Barbershop music 2) Bear to destroy head wear 3) Beat or crumple head wear 4) Chapeau 5) Flat-topped hat 6) Gondolier 7) Hat type 8) He comes about 9) Leghorn 10) Oarsman or his headwear 11) One leaving a wake 12) One making a wake 13) One on board an outboard 14) One out on the lake 15) One punting 
Found on 
https://www.crosswordclues.com/clue/boater

1) Boatman 2) Canoeist 3) Cap 4) Ferryman 5) Gondolier 6) Gondoliere 7) Hat 8) Leghorn 9) Oarsman 10) Paddler 11) Punter 12) Rower 13) Strawhat 14) Waterman 
Found on 
https://www.crosswordclues.com/clue/boater

 A boater (also straw boater, basher, skimmer, cady, katie, somer, sennit hat, or in Japan, can-can hat) is a kind of men`s formal summer hat. It is normally made of stiff sennit straw and has a stiff flat crown and brim, typically with a solid or striped grosgrain ribbon around the crown. Boaters were popular as casual summer headgear in the late....
Found on 
http://en.wikipedia.org/wiki/Boater

Flat-topped hat with small flat brim. traditionally, made of stiffened straw braid.
Found on 
http://www.encyclo.co.uk/local/21746

A boater is a stiff straw hat with a straight brim and flat crown originally designed for wearing while punting on a river.
Found on 
http://www.probertencyclopaedia.com/browse/PB.HTM

[
n] - a stiff straw hat with a flat crown
Found on 
http://www.webdictionary.co.uk/definition.php?query=boater
leghorn noun a stiff hat made of straw with a flat crown
Found on 
https://www.encyclo.co.uk/local/20974

a person who boats, esp. for pleasure. · a stiff straw hat with a shallow, flat-topped crown, ribbon band, and straight brim.
Found on 
https://www.infoplease.com/dictionary/boater
  No exact match found.