Monkey rushes out of its tree? (6)
I believe the answer is:
rhesus
'monkey' is the definition.
(rhesus monkey is a kind of monkey)
'rushes out of its tree?' is the wordplay.
'rushes' anagrams to 'RHESUS'.
Though, I am not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for rhesus that I've seen before include "Monkey - factor in blood cell problem" , "Primate" , "Blood type or sort of monkey" , "Type of small monkey" , "The Rh in "Rh factor"" .)