Sell a return half to some sailor (6)
I believe the answer is:
retail
'sell' is the definition.
(I know this)
'a return half to some sailor' is the wordplay.
'half' means to take half the letters.
'to some sailor' becomes 'ail' (I am not sure about this - if you are sure you should believe this answer much more).
'return' with half the letters taken is 'ret'.
'ret'+'ail'='RETAIL'
Can you help me to learn more?
(Other definitions for retail that I've seen before include "The sale of goods to the public" , "Sell (in shop)" , "Sell in small quantities" , "The selling of goods to consumers" , "Narrate or sell to public" .)