What does the cryptic crossword clue "Retailer upset smart Dane (9)" mean?

The definition is "Retailer". The wordplay uses an anagram. anagram of SMART + DANE = TRADESMAN; definition: "Retailer" The answer is TRADESMAN.

Retailer upset smart Dane (9)

Daily Mail Cryptic #17041 | 14 Across | 2023-02-24 flower