Bury Town's first half leads to major boost after even second half (6)
I believe the answer is:
entomb
'bury' is the definition.
('entomb' can be a synonym of 'bury')
'town's first half leads to major boost after even second half' is the wordplay.
'first half' suggests halving the letters.
'leads to' suggests taking the first letters.
'after' says to put letters next to each other.
'second half' means to take half the letters.
The first letters of 'major boost' is 'mb'.
'town' with half the letters taken is 'to'.
'even' cut in half is 'en'.
'to'+'mb'='tomb'
'tomb' put after 'en' is 'ENTOMB'.
(Other definitions for entomb that I've seen before include "shut up patients?" , "cover late arrival" , "Bury, place in a crypt" , "put in ground" , "Lay to rest in an underground vault" .)