Inter's B Team leaving area on ground (6)
I believe the answer is:
entomb
'inter's' is the definition.
(synonyms)
'b team leaving area on ground' is the wordplay.
'leaving' is a deletion indicator.
'area' becomes 'a' (maths abbreviation).
'ground' indicates anagramming the letters ('grind' the letters into a new form).
'b'+'team'='bteam'
'bteam' with 'a' taken away is 'btem'.
'btem'+'on'='btemon'
'btemon' anagrammed gives 'ENTOMB'.
(Other definitions for entomb that I've seen before include "Incarcerate" , "Place in a grave" , "cover late arrival" , "Bury in vault" , "to finish Aida, for example" .)