Passionate crew flanked by banks of Spey (6)
I believe the answer is:
steamy
'passionate' is the definition.
(I've seen this before)
'crew flanked by banks of spey' is the wordplay.
'crew' becomes 'team' (I've seen this before).
'flanked by' means one lot of letters goes inside another (other letters go on other side).
'banks of' means to remove the middle letters (the banks are the sides of the word).
'spey' with its middle taken out is 'sy'.
'team' going inside 'sy' is 'STEAMY'.
(Other definitions for steamy that I've seen before include "Salacious" , "My seat (anag.)" , "Hot and humid - erotic" , "Erotic; like vapour" , "Passionate" .)