Cancel industrial action (6)
I believe the answer is:
strike
This clue is a double definition.
'cancel' is the first definition.
(striking is a kind of cancelling)
'industrial action' is the second definition.
(I've seen this before)
(Other definitions for strike that I've seen before include "Sudden attack; chime" , "coin" , "Attack - industrial action" , "Hit or take industrial action" , "Downing of tools" .)