Performing dingo, possibly (5)
I believe the answer is:
doing
'performing' is the definition.
('do' can be a synonym of 'perform')
'dingo possibly' is the wordplay.
'possibly' indicates an anagram.
'dingo' with letters rearranged gives 'DOING'.
(Other definitions for doing that I've seen before include "Accomplishing" , "Carrying out action" , "Faring" , "visiting as a tourist" , "Working" .)