Room to eat a Muslim burger, say? (5)
I believe the answer is:
halal
'muslim burger say?' is the definition.
The definition suggests a singular noun which matches the answer.
'room to eat a' is the wordplay.
'room' becomes 'hall' (hall is a kind of room**).
'to eat' indicates putting letters inside.
'hall' enclosing 'a' is 'HALAL'.
Can you help me to learn more?
(Other definitions for halal that I've seen before include "(Meat) from animals slaughtered according to Muslim law" , "Meat fit for Muslims" , "Meat prepared according to Muslim law" , "slaughter" , "authorised food" .)