On the whole Butch embodies upright character (6)

I believe the answer is:

mainly

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'on the whole' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for mainly that I've seen before include "Chiefly, largely" , "Generally or largely" , "Chiefly, principally" , "For the most part" .)

I've seen this clue in The Telegraph.

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