Dizzy Gillespie’s debut I’d seen with dandy? (5)

I believe the answer is:

giddy

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'dizzy' is the definition.
(I know that dizzy can be written as giddy)

'gillespie's debut i'd seen with dandy?' is the wordplay.
'debut' suggests taking the first letters.
'seen with' means one lot of letters go next to another.
'dandy?' becomes 'dy' (I can't justify this - if you can you should believe this answer much more).
The initial letter of 'gillespie' is 'g'.
'g'+'id'+'dy'='GIDDY'

Can you help me to learn more?

(Other definitions for giddy that I've seen before include "Frivolous - in a spin?" , "Frivolous -- liable to fall" , "Dizzy; staggering" , "Flighty or lightheaded." , "Dizzy - flighty" .)

I've seen this clue in the Sydney Morning Herald.

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