Genesis performing selected songs? (5)
I believe the answer is:
onset
'genesis' is the definition.
(I know that genesis can be written as onset)
'performing selected songs?' is the wordplay.
'performing' becomes 'on' (as in being on stage).
'selected songs?' becomes 'set' (set of songs performed at a concert).
'on'+'set'='ONSET'
(Other definitions for onset that I've seen before include "origin" , "Storming" , "Outbreak" , "Attack using stone" , "First signs" .)