Clue: What may result from mishearing lyrics of number in vogue and fresh? (10)
Answer: MONDEGREEN
Explanation: What may result from mishearing lyrics of number in vogue and fresh? (10)
**N**(umber) in **MODE **+ **GREEN** 
A modegreen is a misheard lyric. American writer Sylvia Wright coined the term in 1954, writing about how as a girl she had misheard the lyric "…and laid him on the green" in a Scottish ballad as "…and Lady Mondegreen".