Redesigned a Mister Man to be more conventional (10)

I believe the answer is:

mainstream

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'more conventional' is the definition.
'mainstream' can be an answer for 'conventional' (I've seen this before). I'm unsure of the 'more' bit.

'redesigned a mister man' is the wordplay.
'redesigned' is an anagram indicator.
'a'+'mister'+'man'='amisterman'
'amisterman' anagrammed gives 'MAINSTREAM'.

'to be' is the link.

Can you help me to learn more?

(Other definitions for mainstream that I've seen before include "Conventional, normal" , "type of jazz" , "People representing most common ideas" , "In accordance with what is normal or standard" , "Current" .)

I've seen this clue in The Guardian.

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