What this rugby player demands? Namely, spirit and quantity of beer, perhaps

I believe the answer is:

scrum half

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'what this rugby player demands? namely spirit and quantity of beer perhaps' is the definition.
'scrum half' can be an answer for 'rugby player' (I've seen this before). I'm not certain of the remainder of the definition.

'what this rugby player' is the wordplay.
'what' becomes 'scrum' (I am not sure about this - if you are sure you should believe this answer much more).
'this rugby player' becomes 'half' (short for half-back).
'scrum'+'half'='SCRUM-HALF'

Can you help me to learn more?

(Another definition for scrum half that I've seen is " Rugby player -- March's flu (anag)".)

I've seen this clue in The Telegraph.

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