Tries to sell raptors (5)
I believe the answer is:
hawks
'raptors' is the definition.
(hawk is a kind of raptor)
'tries to sell' is the wordplay.
'tries' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'to' says to put letters next to each other (I've seen this in other clues).
'sell' becomes 'hawk' (hawking is a kind of selling).
's' after 'hawk' is 'HAWKS'.
Can you help me to learn more?
(Other definitions for hawks that I've seen before include "Offers for sale from place to place" , "Birds of prey" .)