Tries pinching end of wet suit (6)
I believe the answer is:
hearts
'suit' is the definition.
(hearts is a playing card suit)
'tries pinching end of wet' is the wordplay.
'tries' becomes 'hears' (as in trying or hearing in a trial).
'pinching' indicates putting letters inside (taking inside).
'end of' indicates one should take the final letters.
The last letter of 'wet' is 't'.
'hears' enclosing 't' is 'HEARTS'.
(Other definitions for hearts that I've seen before include "Card suit and essential organs" , "Suit for vital organs" , "Playing-card suit" , "quarterdeck?" , "Vital organs in the pack" .)