Crossword Genius

Man involved with a girl on the side (8)

Ross

I believe the answer is:

marginal

'the side' is the definition.
(thesaurus)

'man involved with a girl' is the wordplay.
'involved with' indicates anagramming the letters (involved can mean confusing or complex).
'a'+'girl'='agirl'
'man' mixed up with 'agirl' makes 'MARGINAL'.

'on' acts as a link.

(Other definitions for marginal that I've seen before include "Of minor importance" , "Very slight in amount, at the edge" , "On the edges of" , "on border" , "Borderline" .)

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