A move not entirely suitable (7)
I believe the answer is:
apropos
'suitable' is the definition.
(apropos means appropriate or pertinent)
'a move not entirely' is the wordplay.
'move' becomes 'propose' (as in to move or propose a motion in a meeting).
'not entirely' means to remove the last letter (not all of the word).
'propose' with its last letter taken away is 'propos'.
'a'+'propos'='APROPOS'
(Other definitions for apropos that I've seen before include "Suitable or relevant" , "Suitable; to the point" , "In respect of" , "As regards" , "To the point, germane" .)