Endless gluttony limiting black bird (5)
I believe the answer is:
grebe
'bird' is the definition.
(grebe is a kind of bird)
'endless gluttony limiting black' is the wordplay.
'endless' means to remove the last letter.
'gluttony' becomes 'greed' (I've seen this before).
'limiting' indicates putting letters inside.
'black' becomes 'b' (as in pencil classifications).
'greed' with its final letter taken away is 'gree'.
'gree' going around 'b' is 'GREBE'.
(Other definitions for grebe that I've seen before include "Crested water-bird" , "Diving bird which may be crested" , "Small diving waterfowl with a long neck" , "I'll dive in" , "Diver" .)