Crossword Genius

Has a go at drinking a beer, developed as a source of wintergreen (10)

Ross

I believe the answer is:

teaberries

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'a source of wintergreen' is the definition.
I can't tell whether this defines the answer.

'has a go at drinking a beer developed' is the wordplay.
'has a go at' becomes 'tries' (I've seen this in another clue).
'drinking' is an insertion indicator (inserted letters are consumed or drunk).
'developed' indicates an anagram.
'a'+'beer'='abeer'
'abeer' anagrammed gives 'eaber'.
'tries' placed around 'eaber' is 'TEABERRIES'.

'as' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.
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