He blocks outside broadcast rumpus, one filling streets (14)

I believe the answer is:

obstructionist

I'm a little stuck... Click here to teach me more about this clue!

'he blocks outside broadcast' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'rumpus one filling streets' is the wordplay.
I cannot really see how this works, but
'rumpus' could be 'ruction' (synonyms) and 'ruction' is present in the answer.
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Daily Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.