Group of girls needing drink, one Victor rejected (4)
I believe the answer is:
bevy
'group of girls' is the definition.
(I've seen this before)
'drink one victor rejected' is the wordplay.
'drink' becomes 'bevvy' (beverage).
'one victor' becomes 'V' (phonetic alphabet: alpha, bravo, charlie etc.).
'rejected' is a deletion indicator.
'bevvy' with 'v' taken away is 'BEVY'.
'needing' is the link.
(Other definitions for bevy that I've seen before include "Drink - collection of beauties?" , "Flock (eg of quails)" , "Group, of beauties perhaps (4)" , "female company?" , "Group of girls, quail" .)