Refuse drop (7)
I believe the answer is:
decline
This clue is a double definition.
'refuse' is the first definition.
(synonyms)
'drop' is the second definition.
(declining is a kind of dropping)
(Other definitions for decline that I've seen before include "go through cases" , "Refuse - dip" , "The Latin scholar must" , "Fade" , "Dwindle" .)