Crossword Genius

Change course and gear (4)

Ross

I believe the answer is:

tack

I believe this is a double definition.

'change course' is the first definition.
(I've seen this before)

'gear' is the second definition.
(tack is a kind of gear)

'and' acts as a link.

(Other definitions for tack that I've seen before include "Nail - direction (eg of boat)" , "Small nail with broad head" , "pin" , "Short, flat-headed nail" , "Food; nail" .)

I've seen this clue in The Globe and Mail.
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