Make so weak as never to stir tea, possibly (8)

I believe the answer is:

enervate

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'make so weak' is the definition.
I can't judge whether this definition defines the answer.

'never to stir tea possibly' is the wordplay.
'to stir' indicates an anagram.
'possibly' indicates an anagram.
'never' with letters rearranged gives 'enerv'.
'tea' is an anagram of 'ate'.
'enerv'+'ate'='ENERVATE'

'as' is the link.

Can you help me to learn more?

(Other definitions for enervate that I've seen before include "Make drained of energy" , "Take strength from" , "Drain of vitality" , "Cause to feel drained of energy" , "Debilitate" .)

I've seen this clue in the Evening Standard.

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