Crossword Genius

Fanatic getting cross in street: I’m worried (9)

Ross

I believe the answer is:

extremist

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

'fanatic' is the definition.
(thesaurus)

'getting cross in street i'm worried' is the wordplay.
I cannot really understand how this works, but
'getting' could be 're' (I've seen this in other clues) and 're' is present in the answer.
'cross' could be 'x' and 'x' is found in the answer.
'street' could be 'st' and 'st' is found within the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for extremist that I've seen before include "immoderate person" , "One with very radical views" , "His views are anything but neutral" , "One with views far from the mainstream" , "One with views very far from consensus" .)

I've seen this clue in The Times.
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