Wise men with not much imagination? (4)
I believe the answer is:
magi
'wise men' is the definition.
(the three wise men from the nativity)
'not much imagination?' is the wordplay.
'not much' says the answer is hidden in the clue (I've seen 'not much of' mean this).
'MAGI' is hidden in the letters of 'imagination'.
'with' acts as a link.
(Other definitions for magi that I've seen before include "Travellers in NT" , "The three Wise Men of the gospels" , "Nativity story wise men" , "members of priestly caste" , "Biblical wise men" .)