Assert position and lay out wares for sale (3,3,4,5)
I believe the answer is:
set out ones stall
'wares for sale' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'assert position and lay out' is the wordplay.
I cannot quite understand how this works, but
'position' could be 'set' (synonyms) and 'set' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
an anagram of 'out' is 'uto' which is within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for set out ones stall that I've seen before include "Give details of an intention" , "Explain strategy" , "Clearly reveal intention" , "start up as market trader" , "start work at Covent Garden?" .)