Bearded Smurf (4)
I believe the answer is:
papa
'bearded smurf' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for papa that I've seen before include "Father; letter P" , "Comms code for 'P'" , "one after Oscar" , "Pop" , "Mama's other half?" .)