Shatter's work in retrospective starts with scores to settle (6)
I believe the answer is:
bursts
'shatter's work in retrospective starts with scores to settle' is the definition.
I can't judge whether this definition defines the answer.
'work in retrospective starts with scores to settle' is the wordplay.
'work in' becomes 'rub' (I've seen this before).
'retrospective' shows that the letters should be reversed in order.
'starts with' indicates taking the first letters.
The first letters of 'scores to settle' is 'sts'.
'rub' written backwards gives 'bur'.
'bur'+'sts'='BURSTS'
Can you help me to learn more?
(Other definitions for bursts that I've seen before include "Breaks open suddenly" , "Explodes or breaks open" , "Explodes or ruptures" , "Spurts" , "Explodes from inside pressure like balloon" .)