Faulty gadget identified (6)
I believe the answer is:
tagged
'identified' is the definition.
'faulty gadget' is the wordplay.
'faulty' indicates an anagram.
'gadget' anagrammed gives 'TAGGED'.
(Other definitions for tagged that I've seen before include "Gadget (anag)" , "What follower did" , "Labelled (electronically?)" , "Attached a label" , "Identified electronically" .)