Exploit a slogan to encourage retailing? (5,2)
I believe the answer is:
trade on
'exploit' is the definition.
(I've seen this in another clue)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for trade on that I've seen before include "Take advantage of" , "Make use of for one's own advantage - it's not dear" .)