Sells catty lies, with complete lack of judgement (10)
I believe the answer is:
tactlessly
'complete lack of judgement' is the definition.
I can't judge whether this defines the answer.
'sells catty lies' is the wordplay.
'sells catty' anagrams to 'TACTLESSLY'.
However, I'm not sure how the anagram is indicated.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for tactlessly that I've seen before include "In non-diplomatic way" , "In an insensitive manner" , "In an unfeeling manner" .)