Crossword Genius

Large French resort visited by European relative (5-5)

Ross

I believe the answer is:

great-niece

'relative' is the definition.
(I've seen this before)

'large french resort visited by european' is the wordplay.
'large' becomes 'great' (synonyms).
'french resort' becomes 'Nice' (French coastal resort).
'visited by' means one lot of letters goes inside another.
'european' becomes 'E' (abbreviation e.g. EU).
'nice' going around 'e' is 'niece'.
'great'+'niece'='GREAT-NIECE'

I've seen this clue in The Times.
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