A collection of rabbits suffices (4)
I believe the answer is:
does
'suffices' is the definition.
('do' can be a synonym of 'suffice')
'a collection of rabbits' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 'des' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for does that I've seen before include "about 50% of deer" , "some females" , "takes one for a ride" , "female woodlanders" , "Acts" .)