Inter Milan’s leader bet on getting beaten (6)
I believe the answer is:
entomb
'inter' is the definition.
(synonyms)
'milan's leader bet on getting beaten' is the wordplay.
'leader' suggests taking the first letters.
'getting' means one lot of letters go next to another.
'beaten' is an anagram indicator (letters beaten up or destroyed).
The first letter of 'milan' is 'm'.
'm'+'bet'+'on'='mbeton'
'mbeton' with letters rearranged gives 'ENTOMB'.
(Other definitions for entomb that I've seen before include "Cover - bury - hide" , "Bury, place in a crypt" , "Inter" , "Place a dead body in a vault" , "Put in a grave" .)