Go hungry, needing to look about five! (6)
I believe the answer is:
starve
'go hungry' is the definition.
(I've seen this before)
'to look about five' is the wordplay.
'to look' becomes 'stare' (stare is a kind of look**).
'about' means one lot of letters goes inside another.
'five' becomes 'v' (roman numeral).
'stare' enclosing 'v' is 'STARVE'.
'needing' acts as a link.
(Other definitions for starve that I've seen before include "Fail to take in" , "Deprive of food" , "Suffer extreme hunger" , "Averts (anag)" , "Deprive of sustenance" .)