Crossword Genius

Reserve diver (3)

Ross

I believe the answer is:

sub

This clue is a double definition.

'reserve' is the first definition.
(substitute)

'diver' is the second definition.
(submarine)

(Other definitions for sub that I've seen before include "Prefix meaning under or inferior" , "Prefix meaning beneath" , "Underwater boat" , "Underwater craft" , "Warship; membership fee" .)

I've seen this clue in The Times.
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