"Sounds like a plan" (4)
(Other definitions for yes that I've seen before include "Absolutely" , "Aye" , "Affirmative reply" , "Affirmative response" , "Pro vote" .)
(Other definitions for lets that I've seen before include "we shall serve them again!" , "Rents out or allows" , "Permits" , "Yes" , "Leases" .)