Before circuit, regularly cleared mould off bike part (7)

I believe the answer is:

mudflap

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'bike part' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'before circuit regularly cleared mould off' is the wordplay.
'before' is a charade indicator (letters next to each other).
'circuit' becomes 'lap' (synonyms).
'regularly cleared' indicates alternate letters (letters removed at regular intervals).
'mould'+'off'='mouldoff'
The alternate letters of 'mouldoff' are 'mudf'.
'lap' after 'mudf' is 'MUDFLAP'.

Can you help me to learn more?

(Other definitions for mudflap that I've seen before include "Splash guard on a wheel" , "Perhaps Ford's bodyguard" .)

I've seen this clue in The Telegraph.

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