Support British speedcars (7)

I believe the answer is:

bracers

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

'speedcars' is the definition.
I can't tell whether this defines the answer.

'support british' is the wordplay.
'support' becomes 'brace' (brace is a kind of support).
'british' becomes 'rs' (I am not sure about this - if you are sure you should believe this answer much more).
'brace'+'rs'='BRACERS'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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