Rocky debris dog left for bird (7,3)
I believe the answer is:
screech owl
'bird' is the definition.
(screech owl is a type of owl)
'rocky debris dog left' is the wordplay.
'rocky debris' becomes 'scree' (I've seen this in another clue).
'dog' becomes 'chow' (short for chow chow).
'left' becomes 'l' (common abbreviation).
'scree'+'chow'+'l'='SCREECH-OWL'
'for' acts as a link.
(Other definitions for screech owl that I've seen before include "Eg, Tyto alba; howls recce (anag.)" , "Bird of prey" .)