Georgia changes gear at mechanic’s (6)
I believe the answer is:
garage
'mechanic's' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'georgia changes gear' is the wordplay.
'georgia' becomes 'GA' (abbreviation for the US state).
'changes' is an anagram indicator.
'gear' anagrammed gives 'rage'.
'ga'+'rage'='GARAGE'
'at' is the link.
Can you help me to learn more?
(Other definitions for garage that I've seen before include "Room for car" , "Petrol seller; modern music style" , "Building for housing or repairing car" , "Home for the car" , "Source of 4 dn or 16 dn" .)