Crossword Genius

Centre near Cork or Trim for one of those doing a turn? (6)

Ross

I believe the answer is:

hubcap

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

'trim for one of those doing a turn?' is the definition.
I can't tell whether this defines the answer.

'centre near cork' is the wordplay.
'centre' becomes 'hub' (hub is a kind of centre).
'near cork' becomes 'cap' (I can't explain this - if you can you should believe this answer much more).
'hub'+'cap'='HUBCAP'

'or' acts as a link.

Can you help me to learn more?

(Other definitions for hubcap that I've seen before include "It fits over the central part of a wheel" , "Cover for centre of a car's wheel" , "Vehicle wheel trim" , "Cover on a car wheel" , "It fits over the centre of a wheel" .)

I've seen this clue in The Irish Times and the Irish Times (Crosaire).
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