Racing driver considered to have gone flat out (10)

I believe the answer is:

prostrated

'gone flat out' is the definition.
(to prostrate is to lay on the ground)

'racing driver considered' is the wordplay.
'racing driver' becomes 'prost' (racing driver Alain Prost).
'considered' becomes 'rated' (I've seen this before).
'prost'+'rated'='PROSTRATED'

'to have' acts as a link.

(Another definition for prostrated that I've seen is " laid down in submission".)

I've seen this clue in The Guardian.

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