Crossword Genius

Bird which is not all crest (9)

Ross

I believe the answer is:

partridge

'bird' is the definition.
(I know that partridge is a bird)

'is not all crest' is the wordplay.
'is not all' becomes 'part' (I've seen this in another clue).
'crest' becomes 'ridge' (I've seen this in other clues).
'part'+'ridge'='PARTRIDGE'

'which' is the link.

(Other definitions for partridge that I've seen before include "Animal" , "early Christmas present" , "Peculiarly apt girder for the game bird" , "Flier" , "sort of quail" .)

I've seen this clue in The Globe and Mail.
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