Sparks as the TV's not working (4,3)
I believe the answer is:
sets off
'sparks' is the definition.
('set off' can be a synonym of 'spark')
'the tv's not working' is the wordplay.
'the tv's' becomes 'sets' (television set).
'not working' becomes 'off' (switched off).
'sets'+'off'='SETS OFF'
'as' is the link.
(Other definitions for sets off that I've seen before include "Begins a journey" , "Triggers" , "Detonates; starts journey" .)