When jiggled about, pin set to move! (4,2,2)
I believe the answer is:
step on it
'when jiggled' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'pin set to move' is the wordplay.
'move' indicates an anagram.
'pin'+'set'+'to'='pinsetto'
'pinsetto' is an anagram of 'STEP ON IT'.
'about' acts as a link.
Can you help me to learn more?
(Other definitions for step on it that I've seen before include "Go for speed" , "How might one kill an ant" , "improve rate of advance" , "to take advantage of escalating opportunity" , "Hasten" .)