Refer to one in French resort (7)
I believe the answer is:
mention
'refer to' is the definition.
(synonyms)
'one in french resort' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' indicates putting letters inside.
'french resort' becomes 'menton' (town in French riviera).
'i' placed within 'menton' is 'MENTION'.
(Other definitions for mention that I've seen before include "Briefly refer to (something)" , "Speak of - refer to" , "Passing reference" , "Allude to" , "Remark" .)