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Could someone please help me parse:

16 across:
Synthesiser's small volume expanded by twin buttons (4) Answer moog

17 down:
Hear about double celebration, arriving in force for one returning (3.4.2)
Answer get wind of.

21 down: Inspiration for stars raised in a form of football academy originally (6) Answer urania

I see the definition parts but not the cyrptic ones. Glad of any help. Thanks Roger

Twin buttons = O and O
Mg = small volume (milligram)
Small volume expanded by twin buttons - put the OO inside the Mg.
Moog, synthesiser.

17 Double celebration = Twin Do
Force = F
For one = eg, for example, 'returning' = it becomes ge

Ge twin do f.

G

Raised in a form of football = reversal (down clue) of IN A + RU (rugby union).
Then A at the end of the word (academy originally).

21, Urania is the Muse of Astronomy.
"RU "is abb for rugby union football, reversed, "in a" is reversed, and first letter/originally of "a"cademy.

Mg is a measure of weight not volume.
Not happy with this clue, or several others which seem contorted.

Thanks for the clarification, Hollisga. I knew I'd seen 'mg' on labels, but that's all!