Stop count inside assembly (11)
I believe the answer is:
discontinue
'stop' is the definition.
(I know that stop can be written as discontinue)
'count inside assembly' is the wordplay.
'assembly' indicates an anagram.
'count'+'inside'='countinside'
'countinside' anagrammed gives 'DISCONTINUE'.
(Other definitions for discontinue that I've seen before include "Stop providing or making" , "abandon" , "Stop providing/making" , "Stop making (an item)" , "Stop, leave off" .)