Crossword Genius

Ungrateful refusal? (8)

Ross

I believe the answer is:

nothanks

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

'ungrateful' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'refusal?' is the wordplay.
I cannot quite see how this works, but
'refusal?' could be 'no' and 'no' is located in the answer.
The remaining letters 'thanks' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Independent.
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