Eyeballs possibly globes, but not black (5)
I believe the answer is:
ogles
'eyeballs' is the definition.
(to eyeball is to look or ogle at)
'possibly globes but not black' is the wordplay.
'possibly' is an anagram indicator.
'but not' indicates named letters should be taken away.
'black' becomes 'b' (as in pencil classifications).
'globes' with 'b' taken out is 'gloes'.
'gloes' anagrammed gives 'OGLES'.
(Other definitions for ogles that I've seen before include "Casts amorous glances" , "Looks at (someone) lecherously" , "Leers" , "Looks longingly at" , "Looks at amorously, makes eyes at" .)