Baby hawk put back after opening of egg (4)

I believe the answer is:

eyas

I'm a little stuck... Click here to teach me more about this clue!

'baby hawk' is the definition.
'eyas' can be an answer for 'hawk' (eyas is a kind of hawk). I am unsure of the 'baby' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for eyas that I've seen before include "Nestling bird" , "Young falcon" , "Unfledged hawk" , "Nestling hawk" , "Young bird" .)

I've seen this clue in The Times and The Sunday Times.

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