Get rid of some hideous trinkets (4)
I believe the answer is:
'get rid of' is the definition.
(I've seen this before)
'some hideous trinkets' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'OUST' is hidden within 'hideous trinkets'.
(Other definitions for oust that I've seen before include "Turf out" , "Evict" , "kick out" , "Put out, say of office" , "Expel (from a place)" .)