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By the colour, you'll see how old the feathers are (7)

Ross

I believe the answer is:

plumage

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

'feathers are' is the definition.
'plumage' can be an answer for 'feathers' (I've seen this in another clue). I'm not sure about the 'are' bit.

'by the colour you'll see how old' is the wordplay.
'by' says to put letters next to each other.
'the colour you'll' becomes 'plum' (I can't justify this - if you can you should give a lot more credence to this answer).
'see how old' becomes 'age' (I've seen this before).
'plum' next to 'age' is 'PLUMAGE'.

'the' acts as a link.

Can you help me to learn more?

(Other definitions for plumage that I've seen before include "Birds' clothing" , "coat" , "One's feathers" , "A bird's feathers, may be fancy" , "Cover for diver" .)

I've seen this clue in the Evening Standard.
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