Go out with some friend at eight (4)
I believe the answer is:
date
'go out with' is the definition.
(I've seen this before)
'some friend at eight' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'DATE' is hidden within 'friend at eight'.
(Other definitions for date that I've seen before include "Oval fruit" , "Particular time when event happened" , "Stoned fruit" , "Edible fruit with a long woody seed" , "escort" .)