Figure that's a little frightening! (3)
I believe the answer is:
ten
'figure' is the definition.
(I've seen this in other clues)
'a little frightening' is the wordplay.
'a little' indicates a hidden word.
'TEN' is hidden within 'frightening'.
'that's' is the link.
(Other definitions for ten that I've seen before include "How many" , "No of sides of a decagon" , "Base of decimal system" , "Cardinal number" , "Dudley Moore/Bo Derek film" .)