Subdue with a cold “Hurry up!” (7)
I believe the answer is:
chasten
'subdue' is the definition.
(I know that subdue can be written as chasten)
'with a cold hurry up' is the wordplay.
'with' is a charade indicator (letters next to each other).
'a cold' becomes 'c' (eg on taps).
'hurry up' becomes 'hasten' (I've seen this in another clue).
'c'+'hasten' is 'CHASTEN'.
(Other definitions for chasten that I've seen before include "Humble" , "Moderate" , "Punish, purify" , "Subdue, correct by punishing" , "Censure severely" .)