Priest seen in cab — bearded (4)
I believe the answer is:
abbe
'priest' is the definition.
(I've seen this before)
'in cab bearded' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ABBE' can be found hidden inside 'cab bearded'.
'seen' is the link.
(Other definitions for abbe that I've seen before include "address for a priest" , "It's a French ecclesiastic, babe" , "Leading cleric" , "Nice clergyman" , "Angers clergyman" .)