Issue with identification (6)
I believe the answer is:
number
This clue is a double definition.
'issue' is the first definition.
('number' can be a synonym of 'issue')
'identification' is the second definition.
(number is a kind of identification)
'with' is the link.
(Other definitions for number that I've seen before include "27, say" , "Is it sung" , "No longer" , "Mathematical value" , "One possibly" .)