Crossword Genius

A coating (of eggs?) (5)

Ross

I believe the answer is:

layer

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

'a coating' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for layer that I've seen before include "Coating" , "Stratum, tier" , "Bed - hen" , "Hen, perhaps" , "One supplying eggs" .)

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