Friend to Cassady drinks with Austrian composer (8)

I believe the answer is:

ginsberg

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'friend to cassady' is the definition.
I can't tell whether this defines the answer.

'drinks with austrian composer' is the wordplay.
'drinks' becomes 'gins' (gin is a kind of drink).
'with' says to put letters next to each other.
'austrian composer' becomes 'berg' (I've seen this before).
'gins'+'berg'='GINSBERG'

Can you help me to learn more?

(Other definitions for ginsberg that I've seen before include "Allen ..., US poet of the Beat Generation" , "Barge" .)

I've seen this clue in The Independent.

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