It rained terribly thats more charming (8)

I believe the answer is:

daintier

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'more charming' is the definition.
Both the definition and answer are comparative adjectives. Maybe you can see a link between them that I can't see?

'it rained terribly' is the wordplay.
'terribly' indicates an anagram.
'it'+'rained'='itrained'
'itrained' anagrammed gives 'DAINTIER'.

'thats' acts as a link.

Can you help me to learn more?

I've seen this clue in The Mirror.

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