Silly party for a teetotal Yankee (5)

I believe the answer is:

dotty

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

'party for a teetotal yankee' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'for' means one lot of letters go next to another.
'a teetotal' becomes 'tt' (abbreviation).
'yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'do'+'tt'+'y'='DOTTY'

Can you help me to learn more?

(Other definitions for dotty that I've seen before include "Silly; crazy" , "Eccentric, slightly mad" , "Mildly eccentric" , "Slightly mad (colloq.)" , "Barking" .)

I've seen this clue in the Evening Standard.

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