Hooligan caught by CCTV and alarm (6)
I believe the answer is:
vandal
'hooligan' is the definition.
(I've seen this in another clue)
'caught by cctv and alarm' is the wordplay.
'caught by' indicates a hidden word.
'VANDAL' is hidden within 'cctv and alarm'.
(Other definitions for vandal that I've seen before include "Yahoo" , "One who maliciously causes damage" , "Destructive person" , "Ger. tribesman; one who damages property" , "Wanton wrecker" .)