How old is the upside down rag in the car shelter? (6)
I believe the answer is:
garage
'the car shelter?' is the definition.
(I've seen this before)
'how old is the upside down rag' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'rag' is 'gar' which is present in the answer.
'how old' could be 'age' (I've seen this before) and 'age' is present in the answer.
No letters remain.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for garage that I've seen before include "Source of 4 dn or 16 dn" , "Car port" , "Building for a car, or for its maintenance" , "lock-up?" , "Structure for automobiles" .)