2 down
Storm
increased?
Ensure
operation
of
watch
(4,2)
Storm increased? Ensure operation of watch (4,2)
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The whole clue is the definition (& lit or double definition).
How the clue works
Storm increased gives you WIND UP in the sense of the wind getting stronger, and then Ensure operation of watch does exactly the same job — you wind up a mechanical watch to make it tick. Two definitions, one phrase, neat as you like.