Car lent unwisely in a mean location (7)
I believe the answer is:
central
'a mean location' is the definition.
'central' can be an answer for 'location' (central is a kind of location). I am unsure of the 'a mean' bit.
'car lent unwisely' is the wordplay.
'unwisely' indicates anagramming the letters.
'car'+'lent'='carlent'
'carlent' with letters rearranged gives 'CENTRAL'.
'in' is the link.
Can you help me to learn more?
(Other definitions for central that I've seen before include "Near the middle" , "Focal" , "Most important, principal" , "Key" , "Every answer here has one such letter" .)