Crossword Genius

Strangely, he dreamt that he drank with a dormouse (3,3,6)

Ross

I believe the answer is:

the mad hatter

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

'he drank with a dormouse' is the definition.
The definition suggests a singular noun which matches the answer.

'strangely he dreamt that' is the wordplay.
'strangely' indicates anagramming the letters.
'he'+'dreamt'+'that'='hedreamtthat'
'hedreamtthat' anagrammed gives 'THE MAD HATTER'.

Can you help me to learn more?

(Another definition for the mad hatter that I've seen is " party member".)

I've seen this clue in The Guardian Everyman.
Want a hint initially instead of a full solution? Install my app