Not standing for performing every one of the numbers (2,3,5)
I believe the answer is:
on all fours
'not standing for performing every one of the numbers' is the definition.
I can't tell whether this defines the answer.
'performing every one of the numbers' is the wordplay.
'performing' becomes 'on' (as in being on stage).
'every one of' becomes 'all' (I've seen this in another clue).
'the numbers' becomes 'fours' (four is a kind of number).
'on'+'all'+'fours'='ON ALL FOURS'
Can you help me to learn more?
(Other definitions for on all fours that I've seen before include "in a defensive position" , "Maybe crawling" , "using arms and legs" .)