Performing rap where one might get beer (2,3)
I believe the answer is:
on tap
'one might get beer' is the definition.
I can't judge whether this defines the answer.
'performing rap' is the wordplay.
'performing' becomes 'on' (as in being on stage).
'rap' becomes 'tap' (synonyms).
'on'+'tap'='ON TAP'
'where' is the link.
Can you help me to learn more?
(Other definitions for on tap that I've seen before include "Available (for drinking?)" , "Ready to be drawn off, say beer" , "Where you may see H or C" , "Ready for immediate use" , "Freely available" .)