Noise constrained by English final (6)
I believe the answer is:
ending
'final' is the definition.
(thesaurus)
'noise constrained by english' is the wordplay.
'noise' becomes 'din' (din can mean a loud noise or disturbance).
'constrained by' is an insertion indicator.
'english' becomes 'eng' (abbreviation).
'din' going within 'eng' is 'ENDING'.
(Other definitions for ending that I've seen before include "ultimately" , "Gin den (anag.)" , "Close - conclusion" , "Concluding" , "Cessation" .)