Crossword Genius

Poem about area east of Himalayas? It's effervescent stuff (9)

Ross

I believe the answer is:

orangeade

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'effervescent stuff' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'poem about area east of himalayas?' is the wordplay.
'poem' becomes 'ode' (ode is a type of poem).
'about' means one lot of letters goes inside another.
'area' becomes 'a' (maths abbreviation).
'east of' says to put letters next to each other (some letters go to the right of others).
'himalayas?' becomes 'range' (himalayas is a kind of range).
'a' after 'range' is 'rangea'.
'ode' going around 'rangea' is 'ORANGEADE'.

'it's' is the link.

Can you help me to learn more?

(Other definitions for orangeade that I've seen before include "Squash" , "Fruity drink" , "Bubbly drink" , "Pop" , "Soft citrus drink" .)

I've seen this clue in The Times.
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