Obnoxious sort needing a drink (4)

I believe the answer is:

soda

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'drink' is the definition.
(soda is a kind of drink)

'obnoxious sort needing a' is the wordplay.
'obnoxious sort' becomes 'sod' (I can't explain this - if you can you should give a lot more credence to this answer).
'needing' means one lot of letters go next to another.
'sod'+'a'='SODA'

Can you help me to learn more?

(Other definitions for soda that I've seen before include "Alkaline substance used in cleaning, drinks etc" , "Splash served with some spirits" , "Sodium carbonate" , "fizz" , "In the US, a sweet fizzy drink" .)

I've seen this clue in The Independent.

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