Mike brewed Beamish in former wife's address (8)
I believe the answer is:
memsahib
'former wife's address' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'mike brewed beamish in' is the wordplay.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'brewed' is an anagram indicator.
'in' means one lot of letters goes inside another.
'beamish' anagrammed gives 'mesahib'.
'm' inserted within 'mesahib' is 'MEMSAHIB'.
Can you help me to learn more?
(Other definitions for memsahib that I've seen before include "Respectful form of address for married European woman in colonial India" , "Indian madam" , "Married European lady in India" , "Raj lady" , "Old Indian term for European married woman" .)