Scold finished with plait (7)
I believe the answer is:
upbraid
'scold' is the definition.
(I've seen this before)
'finished with plait' is the wordplay.
'finished' becomes 'up' (eg 'time's up' means the time is finished).
'with' says to put letters next to each other.
'plait' becomes 'braid' (synonyms).
'up'+'braid'='UPBRAID'
(Other definitions for upbraid that I've seen before include "Scold over arid pub" , "Dress down" , "Reprove" , "Reproach sternly about arid pub" , "Scold, reproach" .)