Mentioned travelling by boat to market (4)
I believe the answer is:
sale
'to market' is the definition.
(I've seen this in other clues)
'mentioned travelling' is the wordplay.
'mentioned' shows a homophone (sound like).
'travelling' becomes 'sail' (sail is a kind of travelling).
'sail' sounds like 'SALE'.
'by boat' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for sale that I've seen before include "Auction - somewhere in Greater Manchester" , "Transaction" , "Period of lower prices" , "Auction; Cheshire town" , "Disposal of shop's stock at reduced prices" .)