Crossword Genius

Ready to drive off, wearing harness (2,4)

Ross

I believe the answer is:

'ready to drive off' is the definition.
(I've seen this before)

'wearing harness' is the wordplay.
'wearing' becomes 'in' (wear in (and 'in' is fashionable)).
'harness' becomes 'gear' (a harness is the gear of a working animal).
'in'+'gear'='IN GEAR'

(Other definitions for in gear that I've seen before include "Performing effectively", "Out of neutral?", "Ready to move (of car)", "ready to go?", "Working effectively".)

I've seen this clue in The Times.