Wise men can be a little unimaginative (4)
I believe the answer is:
magi
'wise men' is the definition.
(the three wise men from the nativity)
'a little unimaginative' is the wordplay.
'a little' indicates the answer is hidden within the clue (a little bit of the clue).
'MAGI' is hidden within 'unimaginative'.
'can be' is the link.
(Other definitions for magi that I've seen before include "Sorcerers in ancient times" , "Wise men, visitors to Bethlehem" , "present suppliers" , "Biblical wise men" , "Bearers of gold, frankincense and myrrh?" .)