Manage to get note supporting policeman (4)
I believe the answer is:
Here is my best explanation:
'manage' is the definition.
('cope' can be a synonym of 'manage')
'note supporting policeman' is the subsidiary indication.
'note' becomes 'e' (musical note).
'supporting' is a charade indicator (letters next to each other).
'policeman' becomes 'cop' (cop is a kind of policeman).
'e' after 'cop' is 'cope'.
'to get' is the link.
(Other definitions for cope that I've seen before include "Firmly based (in)", "Manage, subsist", "Manage to deal with the vestment", "Successfully deal", "Deal with the cloak", "investment", "Deal effectively (with a difficulty)", "Rise to the occasion", "Manage, come to terms with" and "special cloak".)