Star writer supported by Ravel (9)
I believe the answer is:
pentangle
'star' is the definition.
(I've seen this before)
'writer supported by ravel' is the wordplay.
'writer' becomes 'pen' (something which writes).
'supported by' means one lot of letters go next to another (in a down clue, some letters hold up others).
'ravel' becomes 'tangle' (synonyms).
'pen'+'tangle'='PENTANGLE'
(Other definitions for pentangle that I've seen before include "Five-pointed star" , "mystic symbol" , "Pentagram" .)