Moscow's milk supplier (3)
I believe the answer is:
cow
'milk supplier' is the definition.
(I've seen this in another clue)
'moscow's' is the wordplay.
'COW' is hidden within the letters.
But, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for cow that I've seen before include "Female domestic animal" , "Female seal" , "Female domestic mammal" , "Female of domestic cattle" , "Intimidate; milk producer" .)