Crossword Genius

Corresponded about grey seals (6)

Ross

I believe the answer is:

agreed

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

'corresponded' is the definition.
('agree' can be a synonym of 'correspond')

'about grey seals' is the wordplay.
I cannot quite see how this works, but
'about' could be 're' (regarding) and 're' is found within the answer.
The remaining letters 'aged' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for agreed that I've seen before include "Saw eye to eye" , "Was consistent" , "That's right" , "Settled by common consent" , "Consented, settled" .)

I've seen this clue in The Independent.
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