He impedes outside broadcast furore, one blocking streets (14)

I believe the answer is:

obstructionist

'he impedes' is the definition.
(someone who impedes or obstructs something)

'outside broadcast furore one blocking streets' is the wordplay.
'outside broadcast' becomes 'ob'.
'furore' becomes 'ruction' (ruction means a disturbance).
'one' becomes 'I' (Roman numeral).
'blocking' is an insertion indicator.
'streets' becomes 'st st' (the abbreviation for street repeated).
'ruction'+'i'='ructioni'
'ructioni' put inside 'stst' is 'structionist'.
'ob'+'structionist'='OBSTRUCTIONIST'

I've seen this clue in The Times.

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