Female left relative to show off (6)
I believe the answer is:
flaunt
'show off' is the definition.
('flaunt' can be a synonym of 'show off')
'female left relative' is the wordplay.
'female' becomes 'f' (abbreviation).
'left' becomes 'l' (common abbreviation).
'relative' becomes 'aunt' (aunt is a kind of relative).
'f'+'l'+'aunt'='FLAUNT'
'to' acts as a link.
(Other definitions for flaunt that I've seen before include "What's displayed in Globe" , "Display ostentatiously, brandish" , "Show proudly, provocatively" , "Display very publicly" , "Display ostentatiously, show-off" .)