Flock right back (4)
I believe the answer is:
raft
'flock' is the definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Perhaps you can see an association between them that I don't see?
'right back' is the wordplay.
'right' becomes 'r' (common abbreviation).
'back' becomes 'aft' (associated in meaning).
'r'+'aft'='RAFT'
Can you help me to learn more?
(Other definitions for raft that I've seen before include "Travel on river, in a way" , "Simple craft" , "River transport" , "Vehicle" , "Buoyant platform" .)