Macaque needs bringing back to life outside hospital (6)
I believe the answer is:
rhesus
'macaque' is the definition.
(I know that rhesus is a type of macaque)
'bringing back to life outside hospital' is the wordplay.
'bringing back to life' becomes 'resus' (short for resuscitation).
'outside' means one lot of letters goes inside another.
'hospital' becomes 'h' (abbreviation for hospital on maps).
'resus' placed around 'h' is 'RHESUS'.
'needs' acts as a link.
(Other definitions for rhesus that I've seen before include "Rushes (anag.)" , "Blood type or kind of monkey (6)" , "Type of monkey and a blood component" , "Small, long-tailed monkey" , "Asian monkey - blood factor" .)