Some girl's name describing one short Spice Girl (6)
I believe the answer is:
ginger
'spice girl' is the definition.
(nickname of Geri Halliwell in the Spice Girls)
'some girl's name' is the wordplay.
'some girl' becomes 'g'.
'name' becomes 'inger' ().
'g'+'inger'='GINGER'
'describing one short' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
(Other definitions for ginger that I've seen before include "This 13 [SPICE]" , "Hot-tasting root or general liveliness" , "Hot-tasting rootstock" , "Light reddish colour or hot-tasting flavour" , "Fred Astaire's partner - Greer's gringo (anag)" .)