Crossword Genius

A French male's restrained outside: that's rough (7)

Ross

I believe the answer is:

unkempt

'rough' is the definition.
(thesaurus)

'a french male's restrained outside' is the wordplay.
'a french' becomes 'un' ('a' in French).
'male' becomes 'm' (common abbreviation).
'restrained' becomes 'kept' ('keep' can be a synonym of 'restrain').
'outside' is an insertion indicator.
'm' placed inside 'kept' is 'kempt'.
'un'+'kempt'='UNKEMPT'

'that's' is the link.

(Other definitions for unkempt that I've seen before include "shabby" , "Of uncared for appearance" , "Not neat or cared for" , "Scruffy (appearance)" , "Slovenly" .)

I've seen this clue in The Telegraph.
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