Clue: Landlord in favour of clergyman being denied special old rum, to begin with (10)
Answer: PROPRIETOR
Explanation: Definition: Landlord
A charade of PRO ('in favour of') PRIE[s]T ('clergyman') minus the S ('being denied special') plus OR ('**O**ld **R**um, to begin with'). The definition refers to the host of an inn.