Crossword Genius

Hatters top -- form exceptional, mainly (3,3,4,4)

Ross

I believe the answer is:

for the most part

'mainly' is the definition.
(thesaurus)

'hatters top form exceptional' is the wordplay.
'exceptional' indicates an anagram.
'hatters'+'top'+'form'='hatterstopform'
'hatterstopform' is an anagram of 'FOR THE MOST PART'.

(Other definitions for for the most part that I've seen before include "Mainly" , "in general" , "Chiefly" , "Usually" .)

I've seen this clue in The Telegraph.
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