Last one

[combatmummy]

Please help with my last one....18D men lined up on board catch rare seafood (6) ?R?W?S. I can only think of crew for men on board but don't know any seafood. Don't know if I'd ever finish one of these without you.

[mazie]

Prawns (Pawns +R)

[sandyRoe]

Prawns

[samovar]

Prawns
Men on boards = pawns catching "r" in the middle

[combatmummy]

Thanks guys, obviously have heard of prawns & feel really stupid now. The sea food bit made me think of on board a ship and not of a chess board, which was obviously the trap the setter mean't me to fall into, it's wicked to trick the foolish!