Criminal handlers of stolen goods keeping identification secrets (11)
I believe the answer is:
confidences
'secrets' is the definition.
(confidence is a kind of secret)
'criminal handlers of stolen goods keeping identification' is the wordplay.
'criminal' becomes 'con' (abbreviation for 'convict').
'handlers of stolen goods' becomes 'fences'.
'keeping' is an insertion indicator.
'identification' becomes 'id'.
'fences' placed around 'id' is 'fidences'.
'con'+'fidences'='CONFIDENCES'
(Another definition for confidences that I've seen is " Communications expected to be kept secret".)