Crossword Genius

Dilutes tricky clues? (5)

Ross

I believe the answer is:

thins

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'dilutes' is the first definition.
('thin' can be a synonym of 'dilute')

'tricky clues?' is the second definition.
Although both the answer and definition are verbs in their -s form, I don't understand how they can define each other.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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