Sandy’s liveliness (6)
I believe the answer is:
ginger
This clue is a double definition.
'sandy's' is the first definition.
(hair colour)
'liveliness' is the second definition.
(I know that ginger is a type of liveliness)
(Other definitions for ginger that I've seen before include "Fred Astaire's dancing partner" , "Spicy root, often served with sushi" , "Spice - former Spice Girl" , "Light reddish-yellow" , "This 13 [SPICE]" .)