Crossword Genius

At full speed (4,3)

Ross

I think it could be either:

Which length description are you looking for?:

5

4,3

flat out

'at full speed' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for flat out that I've seen before include "Exhausted - at full speed" , "At top speed or effort - being horizontal?" , "At top speed; intense (effort)" , "Lying on floor" , "very quickly?" .)

I've seen this clue in The Times and The Telegraph.
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