Promise to distribute wares (5)
I believe the answer is:
swear
'promise' is the definition.
(as in swearing something is true)
'distribute wares' is the wordplay.
'distribute' indicates an anagram (I've seen this in other clues).
'wares' is an anagram of 'SWEAR'.
'to' acts as a link.
(Other definitions for swear that I've seen before include "Vow, attest" , "Solemnly promise" , "Curse" , "Emit oath or take vow" , "Use bad language" .)