Goes around a bit with Desmond (7)
I believe the answer is:
departs
'goes' is the definition.
('depart' can be a synonym of 'go')
'around a bit with desmond' is the wordplay.
'around' means one lot of letters goes inside another.
'a bit with' becomes 'part' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'desmond' becomes 'des' (I've seen this in other clues).
'part' put within 'des' is 'DEPARTS'.
Can you help me to learn more?
(Other definitions for departs that I've seen before include "Does runner" , "Quits" , "Goes away" , "Goes, leaves" .)