Reversed rent for retail unit (6)
I believe the answer is:
outlet
'retail unit' is the definition.
'outlet' can be an answer for 'retail' (thesaurus). I'm not sure about the 'unit' bit.
'reversed rent' is the wordplay.
'reversed' becomes 'out' (I am not sure about this - if you are sure you should believe this answer much more).
'rent' becomes 'let' (I've seen this in another clue).
'out'+'let'='OUTLET'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for outlet that I've seen before include "Retail point" , "Exit for water or steam" , "Opening, vent." , "River mouth; shop" , "Store" .)