Manufacturer of pop, like one Jack drinks (5)

I believe the answer is:

oasis

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'manufacturer of pop' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'like one jack drinks' is the wordplay.
'like' becomes 'as'.
'one' becomes 'i' (Roman numeral).
'jack' becomes 'OS' (Ordinary Seaman - jack can mean a sailor).
'drinks' is an insertion indicator (inserted letters are consumed or drunk).
'as'+'i'='asi'
'asi' going inside 'os' is 'OASIS'.

Can you help me to learn more?

(Other definitions for oasis that I've seen before include "Safe haven" , "Green area in desert" , "provides refuge" , "Fertile area in desert" , "Fertile area in 7?" .)

I've seen this clue in The Guardian.

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