Champion providing support when overwhelmed by alcohol (7)

I believe the answer is:

apostle

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'champion' is the definition.
(I know that apostle is a type of believer)

'support when overwhelmed by alcohol' is the wordplay.
'support when' becomes 'post' (post is a kind of support. I am not sure about the 'when' bit.).
'overwhelmed by' indicates putting letters inside (inserted letters get absorbed or overwhelmed).
'alcohol' becomes 'ale' (type of beer).
'post' going inside 'ale' is 'APOSTLE'.

'providing' acts as a link.

Can you help me to learn more?

(Other definitions for apostle that I've seen before include "Early Christian teacher" , "Preacher perhaps" , "Maybe Peter" , "James, perhaps" , "Ardent espouser of new system" .)

I've seen this clue in The Guardian.

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