The most common and most likely answer to this crossword clue is the 10 letter word TRADENAMES
I've seen this crossword clue in The Daily Telegraph
T
R
A
D
E
N
A
M
E
S
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TRADENAMES mean?
TRADENAMES noun- A name used to identify a commercial product or service; may or may not be registered as a trademark.
- The name under which a business or firm operates.