Crossword Genius

Disguised for example in beard and raincoat (9)

Ross

I believe the answer is:

gaberdine

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

'raincoat' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'disguised for example in beard' is the wordplay.
I cannot quite understand how this works, but
'in' is present in the answer.
an anagram of 'beard' is 'aberd' which is located in the answer.
The remaining letters 'ge' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'and' is the link.

Can you help me to learn more?

(Other definitions for gaberdine that I've seen before include "Raincoat fabric" , "twill" , "Mac; began ride (anag.)" .)

I've seen this clue in The Globe and Mail.
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