A drink to mature in two ways (5)

I believe the answer is:

lager

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

'mature in two ways' is the wordplay.
'mature' becomes 'age' (synonyms).
'in' indicates putting letters inside.
'two ways' becomes 'lr' (I can't justify this - if you can you should believe this answer much more).
'age' inserted into 'lr' is 'LAGER'.

'to' is the link.

Can you help me to learn more?

(Other definitions for lager that I've seen before include "Type of beer" , "Regal kind of beer" , "Local offering" , "Light-bodied beer" , "Tipple" .)

I've seen this clue in The Globe and Mail.

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