Selling point of suit incorporating uniform (7)
I believe the answer is:
auction
'selling point' is the definition.
'auction' can be an answer for 'selling' (I've seen this before). I'm not certain of the 'point' bit.
'suit incorporating uniform' is the wordplay.
I cannot quite understand how this works, but
'uniform' could be 'u' (phonetic alphabet: alpha, bravo, charlie etc.) and 'u' is found within the answer.
'suit' could be 'action' (synonyms) and 'action' is present in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for auction that I've seen before include "Offer to bidders" , "Public bidding sale" , "Public sale with lots" , "Competitive sale" , "Public sale to the highest bidder" .)