Woodpecker's pecker (4)
I believe the answer is:
beak
'woodpecker's pecker' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for beak that I've seen before include "Bird bill; magistrate" , "Nose (slang)" , "Bill; nose" , "Mandible" , "Bird's mouth" .)