Hello Glenn! Some leer! (4)
I believe the answer is:
ogle
'leer' is the definition.
(I've seen this in another clue)
'hello glenn some' is the wordplay.
'some' indicates a hidden word.
'OGLE' is hidden in the letters of 'hello glenn'.
(Other definitions for ogle that I've seen before include "Look at lecherously" , "John -, diarist, - Waugh, novelist" , "View lecherously" , "Lecherous look" , "Stare at in a lecherous manner" .)