A monkey rushes about (6)

I believe the answer is:

rhesus

'a monkey' is the definition.
(I know that rhesus is a type of macaque)

'rushes about' is the wordplay.
'about' indicates anagramming the letters.
'rushes' is an anagram of 'RHESUS'.

(Other definitions for rhesus that I've seen before include "Usually a positive factor in man" , "Kind of monkey (or factor)" , "Type of macaque" , "Primate" , "Small Indian monkey" .)

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