The most common and most likely answer to this crossword clue is the 7 letter word TOUTING
I've seen this crossword clue in The Guardian
T
O
U
T
I
N
G
More clues leading to the result TOUTING
Buddy explains!
The straight part
We know that "Try to sell" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case try to sell = touting.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 TOUTING mean?
TOUTING verb- To flaunt, to publicize/publicise; to boast or brag; to promote.
- To look upon or watch.
- To spy out information about (a horse, a racing stable, etc.).
- To give a tip on (a racehorse) to a person, with the expectation of sharing in any winnings.
- To spy out the movements of racehorses at their trials, or to get by stealth or other improper means the secrets of the stable, for betting purposes.
- To act as a tout; to give a tip on a racehorse.
- To look for, try to obtain; used with for.
- The act of one who touts.