I get strained, break and come apart (12)
I believe the answer is:
disintegrate
'come apart' is the definition.
(thesaurus)
'i get strained break' is the wordplay.
'break' is an anagram indicator.
'i'+'get'+'strained'='igetstrained'
'igetstrained' with letters rearranged gives 'DISINTEGRATE'.
'and' is the link.
(Other definitions for disintegrate that I've seen before include "Fall apart - it isn't agreed (anag)" , "collapse" , "Crumble" , "Lose all cohesion" , "Go to pieces" .)