Crossword Genius

Mostly, or possibly all, grey (7)

Ross

I believe the answer is:

largely

'mostly' is the definition.
('largely' can be a synonym of 'mostly')

'possibly all grey' is the wordplay.
'possibly' indicates an anagram.
'all'+'grey'='allgrey'
'allgrey' anagrammed gives 'LARGELY'.

'or' is the link.

(Other definitions for largely that I've seen before include "Mostly found in gallery" , "Fro the most part" , "to a considerable extent" , "On the whole" , "as a rule" .)

I've seen this clue in the Evening Standard.
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