Crossword Genius

Put off weightwatcher wanting the tiniest serving of ice-cream (5)

Ross

I believe the answer is:

deter

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'put off' is the definition.
(both can mean to discourage)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for deter that I've seen before include "Discourage (someone from an action)" , "Discourage, put off" , "Frighten off; prevent" , "Discourage or prevent from doing something" , "'Discourage, dissuade (5)'" .)

I've seen this clue in The Times.
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