Let sit, to rejig heel (8)
I believe the answer is:
stiletto
'heel' is the definition.
(stiletto heel is a kind of heel)
'let sit to rejig' is the wordplay.
'let sit to' can be anagrammed to 'STILETTO'.
Though, I am not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for stiletto that I've seen before include "Slender dagger, heel" , "Long dagger" , "Bedspread" , "Small dagger and high narrow heel" , "Thin blade" .)