Manage to finish after reins put in a tangle (11)
I believe the answer is:
superintend
'manage' is the definition.
(I know that manage can be written as superintend)
'finish after reins put in a tangle' is the wordplay.
'finish' becomes 'end' (synonyms).
'after' is a charade indicator (letters next to each other).
'in a tangle' indicates anagramming the letters.
'reins'+'put'='reinsput'
'reinsput' with letters rearranged gives 'superint'.
'end' put after 'superint' is 'SUPERINTEND'.
'to' is the link.
(Other definitions for superintend that I've seen before include "Supervise" , "run" , "Oversee" , "Be responsible for the management of" , "monitor" .)