Imagine cuddling old priests (4)
I believe the answer is:
magi
'old priests' is the definition.
(the magi were ancient Persian priests)
'imagine cuddling' is the wordplay.
'cuddling' indicates the answer is hidden within the clue (the answer is cuddled by the clue).
'MAGI' can be found hidden inside 'imagine'.
(Other definitions for magi that I've seen before include "Christmas travellers" , "present suppliers" , "The sages who visited Jesus and Mary and Joseph shortly after Jesus was born" , "Three Wise Men from the East" , "Wise men who were guided by a star" .)