Crossword Genius

On cracker, cuckoo bird (9)

Ross

I believe the answer is:

corn crake

'bird' is the definition.
(I've seen this before)

'on cracker cuckoo' is the wordplay.
'cuckoo' is an anagram indicator.
'on'+'cracker'='oncracker'
'oncracker' anagrammed gives 'CORN-CRAKE'.

(Other definitions for corn crake that I've seen before include "Grassland bird with rasping call" , "Secretive grassland bird" , "Rail nesting in hayfields" , "Elusive grassland bird" , "Secretive bird of grasslands" .)

I've seen this clue in The Guardian.
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