Crossword Genius

I rib Smiths fans - it's a local custom (10)

Ross

I believe the answer is:

britishism

'a local custom' is the definition.
(custom or characteristic of the British)

'i rib smiths fans' is the wordplay.
'fans' indicates anagramming the letters (I've seen 'fanned' mean this (I've seen this in other clues)).
'i'+'rib'+'smiths'='iribsmiths'
'iribsmiths' with letters rearranged gives 'BRITISHISM'.

'it's' acts as a link.

(Another definition for britishism that I've seen is " it's a UK thing".)

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.