Mr Cotton’s forename? (4)
I believe the answer is:
otto
'mr' is the definition.
'cotton's forename?' is the wordplay.
'OTTO' is hidden in amongst the letters.
However, I'm not sure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for otto that I've seen before include "he goes" , "Rose oil - Holy Roman Emperor" , "perfume maker" , "Name of four German kings" , "He's a German, whichever way you look at it" .)