He has a couple of supporters going round (5)

I believe the answer is:

biker

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'he has a couple' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'supporters going round' is the wordplay.
'supporters' becomes 'bike' (I can't explain this - if you can you should believe this answer much more).
'going' becomes 'withdrawing' (withdrawing is a kind of going).
'round' indicates the central letters.
The centre of 'withdrawing' is 'r'.
'bike'+'r'='BIKER'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for biker that I've seen before include "Rider" , "Motorcyclist" , "Hell's Angel?" , "Motorcycist" .)

I've seen this clue in the Evening Standard.

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