One could go off with detective working around schedule (9)
I believe the answer is:
detonator
'one could go off' is the definition.
'detective working around schedule' is the wordplay.
'detective' becomes 'det' (abbreviation for detective).
'working' becomes 'on'.
'around' says the letters should be written backwards.
'schedule' becomes 'rota' (I've seen this before**).
'rota' reversed gives 'ator'.
'det'+'on'+'ator'='DETONATOR'
'with' acts as a link.
(Other definitions for detonator that I've seen before include "this will cause an outburst" , "cap" , "means to cause explosion" , "One sets off bang" , "Device for setting off a bomb" .)