Crossword Genius

Criminal in France, very old-fashioned royal (10)

Ross

I believe the answer is:

trespasser

'criminal' is the definition.
(someone trespassing someone else's property)

'in france very old-fashioned royal' is the wordplay.
'in france very' becomes 'tres' ('very' in French).
'old-fashioned' becomes 'passe' (synonyms).
'royal' becomes 'r' (abbreviation).
'tres'+'passe'+'r'='TRESPASSER'

(Other definitions for trespasser that I've seen before include "Uninvited visitor" , "sinner" , "One unlawfully entering another's land" , "Intruder into another's land" , "Misplaced individual" .)

I've seen this clue in The Guardian.
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