In Parliament he's issuing paper (6)

I believe the answer is:

thesis

'paper' is the definition.
(thesaurus)

'in parliament he's issuing' is the wordplay.
'in' indicates a hidden word.
'THESIS' is hidden within 'parliament hes issuing'.

(Other definitions for thesis that I've seen before include "He sits (anag) - treatise" , "Scholarly dissertation" , "Student dissertation" , "Long dissertation written to obtain university degree" , "Proposition" .)

I've seen this clue in The Telegraph.

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