"Gimme five!" (2,3)
I believe the answer is:
up top
'gimme five' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for up top that I've seen before include "In respect of intelligence" , "relating to intelligence" , "In the head (colloq.)" , "in the brain" , "in the Intelligence Department" .)