Speciality in hotel occupying French resort (5)
I believe the answer is:
niche
'speciality' is the definition.
(I've seen this before)
'hotel occupying french resort' is the wordplay.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'occupying' means one lot of letters goes inside another.
'french resort' becomes 'nice' (I've seen this before).
'h' going inside 'nice' is 'NICHE'.
'in' acts as a link.
(Other definitions for niche that I've seen before include "somewhere comfortable" , "Comfortable position" , "Suitable spot" , "small specialised market" , "Position well suited to the occupier" .)