Detector said to be cut (6)
I believe the answer is:
censor
'be cut' is the definition.
(thesaurus)
'detector said' is the wordplay.
'detector' becomes 'sensor' (synonyms).
'said' shows a homophone (sound like).
'sensor' is a homophone of 'CENSOR'.
'to' is the link.
(Other definitions for censor that I've seen before include "He may ban films or books" , "Check contents of letter, play etc with a view to deleting passages" , "Blue-pencilling official" , "Remove offensive parts" , "Crones (anag) - (person with powers to) make cuts in letters, plays etc" .)