At top speed, punctured tyre abroad (4,3)

I believe the answer is:

flat out

'at top speed' is the definition.
(working flat out is working fast)

'punctured tyre abroad' is the wordplay.
'punctured tyre' becomes 'flat' (flat tyre).
'abroad' becomes 'out' (abroad can mean away or out).
'flat'+'out'='FLAT OUT'

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

I've seen this clue in The Times.

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