Trouble-maker gets broadcast spoilt (8)
I believe the answer is:
impaired
'spoilt' is the definition.
('impair' can be a synonym of 'spoil')
'trouble-maker gets broadcast' is the wordplay.
'trouble-maker' becomes 'imp'.
'gets' says to put letters next to each other.
'broadcast' becomes 'aired' (synonyms).
'imp'+'aired'='IMPAIRED'
(Other definitions for impaired that I've seen before include "Hampered" , "Defective" , "Disabled" , "Damaged, marred" , "handicapped" .)