Crossword Genius

Encourage chopper making extension for hatching birds (3,5)

Ross

I believe the answer is:

egg tooth

'extension for hatching birds' is the definition.
(extension used for breaking out of an egg)

'encourage chopper' is the wordplay.
'encourage' becomes 'egg'.
'chopper' becomes 'tooth' (I've seen this before).
'egg'+'tooth'='EGG-TOOTH'

'making' is the link.

(Another definition for egg tooth that I've seen is " means to break out of shell".)

I've seen this clue in The Guardian.
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