Crossword Genius

Warning in sale, as gold is shifted (7)

Ross

I believe the answer is:

caution

I'm a little stuck... Click here to teach me more about this clue!

'warning' is the definition.
(as in a police caution)

'sale as gold is shifted' is the wordplay.
I cannot quite see how this works, but
'gold' could be 'au' (Au is the chemical symbol for gold) and 'au' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?

(Other definitions for caution that I've seen before include "Give a warning to" , "Caveat, prudence" , "Carefulness - yellow card?" , "amusing type" , "A surprising person" .)

I've seen this clue in The Telegraph.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.