Get mad, then settle and come to an understanding (3,3,5)
I believe the answer is:
see the light
'come to an understanding' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'get mad then settle' is the wordplay.
'get mad' becomes 'seethe' (I've seen this in another clue).
'then' says to put letters next to each other.
'settle' becomes 'light' (light can mean to settle or land).
'seethe'+'light'='SEE THE LIGHT'
'and' is the link.
Can you help me to learn more?
(Other definitions for see the light that I've seen before include "Come to understand" , "Gain sudden understanding" , "Realise one's mistake" , "get it?" , "Become converted" .)