Possibly early bird at the egg farm (5)

I believe the answer is:

layer

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

'bird at the egg farm' is the definition.
I can't tell whether this defines the answer.

'possibly early' is the wordplay.
'possibly' indicates anagramming the letters.
'early' with letters rearranged gives 'LAYER'.

Can you help me to learn more?

(Other definitions for layer that I've seen before include "Single thickness and hen" , "Stratum, tier" , "Blanket - single thickness" , "Coating" , "Stratum; eg, hen" .)

I've seen this clue in the Evening Standard.

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