Crew is expected to get clever (4)
I believe the answer is:
wise
'clever' is the definition.
(I've seen this before)
'crew is expected to get' is the wordplay.
'to get' indicates a hidden word (I've seen 'gets' mean this).
'WISE' can be found hidden inside 'crew is expected'.
(Other definitions for wise that I've seen before include "Having good judgement" , "` `A word to the .... is enough' '" , "Having discernment" , "Sage, knowing" , "Showing sagacity" .)