Organised crime not building telephone system (8)
I believe the answer is:
intercom
'telephone system' is the definition.
(I've seen this before)
'organised crime not' is the wordplay.
'organised' indicates an anagram.
'crime'+'not'='crimenot'
'crimenot' is an anagram of 'INTERCOM'.
'building' acts as a link.
(Other definitions for intercom that I've seen before include "Short-range telephone system" , "Phone system inside building" , "Speaker system" , "way to communicate" , "Receiver" .)