Crossword Genius

Doctor and city tried to obtain proof of citizenship (8,4)

Ross

I believe the answer is:

identity card

'proof of citizenship' is the definition.
(type of identification)

'doctor and city tried' is the wordplay.
'doctor' indicates an anagram.
'and'+'city'+'tried'='andcitytried'
'andcitytried' with letters rearranged gives 'IDENTITY CARD'.

'to obtain' is the link.

(Other definitions for identity card that I've seen before include "personal document" , "Acidity trend (anag.)" , "credentials" .)

I've seen this clue in The Telegraph.
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