Revolutionary male doctor went down to find monkey (8)
I believe the answer is:
marmoset
'monkey' is the definition.
(I know that marmoset is a type of New World monkey)
'revolutionary male doctor went down' is the wordplay.
'revolutionary' says the letters should be written in reverse.
'male' becomes 'ram' (male sheep).
'doctor' becomes 'mo' (medical officer).
'went down' becomes 'set' (eg the sun goes down or sets).
'ram' reversed gives 'mar'.
'mar'+'mo'+'set'='MARMOSET'
'to find' acts as a link.
(Other definitions for marmoset that I've seen before include "Arms me to (anag) - animal" , "rather small creature" , "Small bushy-tailed monkey" , "Small New World monkey" , "Little monkey" .)