Greeting crew members with fish (9)
I believe the answer is:
handshake
'greeting' is the definition.
(I've seen this before)
'crew members with fish' is the wordplay.
'crew members' becomes 'hands' (I've seen this in another clue).
'with' is a charade indicator (letters next to each other).
'fish' becomes 'hake' (hake is a kind of fish).
'hands'+'hake'='HANDSHAKE'
(Other definitions for handshake that I've seen before include "introductory offer?" , "Friendly gesture" , "Physical greeting" , "acknowledgment" , "Gesture of greeting or of agreeing a deal" .)