Suddenly produce whip, number recoiling (6,2)
I believe the answer is:
switch on
'suddenly produce whip number recoiling' is the definition.
I can't tell whether this defines the answer.
'whip number recoiling' is the wordplay.
'whip' becomes 'switch' (I've seen this before).
'number' becomes 'no' (abbreviation for 'number').
'recoiling' says the letters should be written backwards.
'no' reversed gives 'on'.
'switch'+'on'='SWITCH ON'
Can you help me to learn more?
(Other definitions for switch on that I've seen before include "Activate (equipment)" , "Give power" , "trigger" , "fire" , "Engage an electrical device" .)