Englishman may clean up? (3)
I believe the answer is:
pom
'englishman' is the definition.
(pom is a kind of englishman)
'clean up?' is the wordplay.
'clean' becomes 'mop' (mopping is a kind of cleaning).
'up?' says the letters should be written in reverse (in down clue: letters go upwards).
'mop' written backwards gives 'POM'.
'may' acts as a link.
(Other definitions for pom that I've seen before include "Small dog (colloq.)" , "Shortened name for a breed of dog" , "Pomeranian dog" , "Englishman in Australia" , "Britisher in Oz" .)