Brother maybe holding a hotel address in Mumbai? (5)
I believe the answer is:
sahib
'address in mumbai?' is the definition.
(polite form of address in India)
'brother maybe holding a hotel' is the wordplay.
'brother maybe' becomes 'sib' (short for sibling).
'holding' means one lot of letters goes inside another.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'a'+'h'='ah'
'sib' enclosing 'ah' is 'SAHIB'.
(Other definitions for sahib that I've seen before include "Indian gentleman" , "Cultured man" , "Polite Indian title" , "Indian title of respect" , "Sir (raj)" .)