Bird disturbing star, a slob (9)
I believe the answer is:
albatross
'bird' is the definition.
(albatross is a kind of bird)
'disturbing star a slob' is the wordplay.
'disturbing' indicates anagramming the letters (I've seen this in other clues).
'star'+'a'+'slob'='staraslob'
'staraslob' anagrammed gives 'ALBATROSS'.
(Other definitions for albatross that I've seen before include "Long-winged sea-bird, a constant burden" , "that golfer with a hole in one might register?" , "Golf course achievement > accounting for handicap" , "Hole played in three strokes under par" , "shot by elderly sailor" .)