Bert at speed becomes splashed with mud (11)

I believe the answer is:

bespattered

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'splashed with mud' is the definition.
I can't tell whether this defines the answer.

'bert at speed becomes' is the wordplay.
'becomes' indicates anagramming the letters.
'bert'+'at'+'speed'='bertatspeed'
'bertatspeed' anagrammed gives 'BESPATTERED'.

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(Other definitions for bespattered that I've seen before include "Splashed with liquid" , "covered in splashes" .)

I've seen this clue in The Irish News.

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