Say the Barclays International clients want ID reset? (9,5)
I believe the answer is:
identical twins
'say the barclays' is the definition.
(twin businessmen David and Frederick Barclay)
'international clients want id reset?' is the wordplay.
'international' becomes 'i' (abbreviation eg in IMF).
'reset?' indicates anagramming the letters (I've seen 'reset' mean this).
'clients'+'want'+'id'='clientswantid'
'clientswantid' with letters rearranged gives 'denticaltwins'.
'i'+'denticaltwins'='IDENTICAL TWINS'
(Another definition for identical twins that I've seen is " Certain siblings".)