One shooting curvaceous feature on a model perhaps (6,3)
I believe the answer is:
cupids bow
This might be a double definition.
'one shooting curvaceous feature' is the first definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'model perhaps' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'on a' is the link.
Can you help me to learn more?
(Other definitions for cupids bow that I've seen before include "It delivers the darts of love!" , "shape of lips?" , "arm of 6 Down [PUTTO]?" , "Shapely mouth" , "Lover boy's weapon" .)