Shake and strive to hold bad child (7)
I believe the answer is:
vibrate
'shake' is the definition.
(I've seen this before)
'strive to hold bad child' is the wordplay.
'strive' becomes 'vie' (I've seen this in other clues).
'to hold' is an insertion indicator.
'bad child' becomes 'brat' (brat is a kind of child. I am not sure about the 'bad' bit.).
'vie' going around 'brat' is 'VIBRATE'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for vibrate that I've seen before include "tremble" , "Shake, quiver, or throb" , "Move rapidly to and fro" , "Oscillate rapidly" , "swing" .)