Spooner's married a boxer called David - that's progress (7)

I believe the answer is:

headway

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'that's progress' is the definition.
(headway is a kind of progress)

I don't understand the remainder of the clue.

(Other definitions for headway that I've seen before include "Ground" , "make progress" , "Progress or forward motion" , "Advance" , "Progress or success in work" .)

I've seen this clue in The Independent.

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