The most common and most likely answer to this crossword clue is the 6 letter word SILVER
I've seen this crossword clue in The Times
S
I
L
V
E
R
More clues leading to the result SILVER
- Metal shaving twisted internally
- Fictional horse's reward for finishing second
- Second prize for pirate
- Unruly devils later seizing power given valuable cover
- Urgent devil, so deviously persuasive
- Minister, 50, is about to get tangible awards?
- . Argentine fossil vertebrae exhibits
- Creation of 16 across, money
- A metal splinter I picked up
- Metal shard I moved forward
Buddy explains!

The straight part
We know that "persuasive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case persuasive = silver.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 SILVER mean?
SILVER noun- A lustrous, white, metallic element, atomic number 47, atomic weight 107.87, symbol Ag.
- (collectively) Coins made from silver or any similar white metal.
- (collectively) Cutlery and other eating utensils, whether silver or made from some other white metal.
- (collectively) Any items made from silver or any other white metal.
- A shiny gray color.
- Anything resembling silver; something shiny and white.
- To acquire a silvery colour.
- To cover with silver, or with a silvery metal.
- To polish like silver; to impart a brightness to, like that of silver.
- To make hoary, or white, like silver.
- Made from silver.
- Made from another white metal.
- Having a color like silver: a shiny gray.
- Denoting the twenty-fifth anniversary, especially of a wedding.
- (of commercial services) Premium, but inferior to gold.
- Having the clear, musical tone of silver; soft and clear in sound.