Crossword Genius

Head source to sound warning about abstract art? (4,3)

Ross

I believe the answer is:

beer tap

I'm a little stuck... Click here to teach me more about this clue!

'head source' is the definition.
I know nothing about this answer so I can't judge whether this works.

'sound warning about abstract art?' is the wordplay.
'sound warning' becomes 'beep' (I can't justify this - if you can you should give a lot more credence to this answer).
'about' means one lot of letters goes inside another.
'abstract' indicates anagramming the letters.
'art' anagrammed gives 'rta'.
'beep' placed around 'rta' is 'BEER TAP'.

'to' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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