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Cat sat, finally tumbling in well (13)

Ross

I believe the answer is:

fantastically

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

'well' is the definition.
Both the definition and answer are adverbs. Maybe they are linked in a way I don't understand?

'cat sat finally tumbling' is the wordplay.
'tumbling' indicates an anagram.
'cat'+'sat'+'finally'='catsatfinally'
'catsatfinally' anagrammed gives 'FANTASTICALLY'.

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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