Warning in sale, as gold is shifted (7)
I believe the answer is:
caution
'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" .)