Muscly type miles more posh after makeover (9)

I believe the answer is:

mesomorph

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'muscly type' is the definition.
The definition suggests a singular noun which matches the answer.

'miles more posh after makeover' is the wordplay.
'miles' becomes 'm' (common abbreviation).
'after makeover' is an anagram indicator.
'more'+'posh'='moreposh'
'moreposh' anagrammed gives 'esomorph'.
'm'+'esomorph'='MESOMORPH'

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