Type of butter that's a bit spring-heeled (4)
I believe the answer is:
ghee
'type of butter' is the definition.
(I've seen this before)
'a bit spring-heeled' is the wordplay.
'a bit' says the answer is hidden in the clue (the answer is formed by a bit of the clue).
'GHEE' can be found hidden inside 'spring heeled'.
'that's' is the link.
(Other definitions for ghee that I've seen before include "Clarified butter used in Indian cookery" , "type of butter" , "Form of clarified butter" , "Use it to cook" , "clarified product" .)