After accident large tin is intact (8)
I believe the answer is:
integral
'intact' is the definition.
('integral' can be a synonym of 'intact')
'after accident large tin' is the wordplay.
'after accident' indicates an anagram (I've seen this in other clues).
'large'+'tin'='largetin'
'largetin' with letters rearranged gives 'INTEGRAL'.
'is' is the link.
(Other definitions for integral that I've seen before include "Belonging as an essential part" , "Forming an essential part" , "Maths function; entire" , "Maths function; whole" , "Necessary as part of a whole, like triangle" .)