The most common and most likely answer to this crossword clue is the 6 letter word PEDDLE
I've seen this crossword clue in The Daily Telegraph
P
E
D
D
L
E
More clues leading to the result PEDDLE
- Sound cycle: ‘Hawk‘
- Push part of bike, we hear
- Go from door to door selling bicycle part, reportedly
- Push lever operated by foot in pronounced way
- Held department up showing offer for sale
- Sell famous footballer, divine in the middle
- Push bike reportedly
- One propels bike, caught in traffic
- Offer for sale held department back somewhat
- Push up in battlefield deployment
Buddy explains!

The straight part
We know that "Sell" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sell = peddle.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 PEDDLE mean?
PEDDLE verb- To sell things, especially door to door or in insignificant quantities.
- To sell illegal narcotics.
- To spread or cause to spread.