Follow the queue (4)
I believe the answer is:
tail
This clue is a double definition.
'follow' is the first definition.
(both can mean to chase or pursue)
'queue' is the second definition.
(I've seen this before)
'the' acts as a link.
(Other definitions for tail that I've seen before include "bum" , "Queue" , "Caudal fin" , "Follow furtively like private detective" , "private eye" .)