Unruly local teens gathered round end of street in cluster (11)
I believe the answer is:
constellate
'cluster' is the definition.
('constellate' can be a synonym of 'cluster')
'unruly local teens gathered round end of street' is the subsidiary indication.
'unruly' is an anagram indicator.
'gathered round' means one lot of letters goes inside another.
'end of' indicates one should take the final letters.
The final letter of 'street' is 't'.
'local'+'teens'='localteens'
'localteens' with letters rearranged gives 'constellae'.
'constellae' placed around 't' is 'constellate'.
'in' is the link.
(Other definitions for constellate that I've seen before include "Bring together" , "Group" .)