Analysed lung, damaged many years ago (4,4,4)
I believe the answer is:
auld lang syne
'many years ago' is the definition.
'analysed lung damaged' is the wordplay.
'damaged' is an anagram indicator.
'analysed'+'lung'='analysedlung'
'analysedlung' with letters rearranged gives 'AULD LANG SYNE'.
(Other definitions for auld lang syne that I've seen before include "Hogmanay song" , "New Year song" , "Old times, especially remembered with affection" , "New Year's Eve favourite" , "New Year's Eve ditty" .)