Girl, black, put out of action (7)
I believe the answer is:
disable
'put out of action' is the definition.
(I've seen this before)
'girl black' is the wordplay.
'girl' becomes 'di'.
'black' becomes 'sable' (sable is a kind of black).
'di'+'sable'='DISABLE'
(Other definitions for disable that I've seen before include "Make inoperable" , "For hamstring" , "Weaken" , "Deactivate" , "Incapacitate" .)