Chromium enduring, not potassium? Suspicious behaviour (8)
I believe the answer is:
creeping
'enduring not potassium? suspicious behaviour' is the definition.
I can't tell whether this definition defines the answer.
'chromium' is the wordplay.
I cannot quite understand how this works, but
'chromium' could be 'cr' (chemical symbol) and 'cr' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for creeping that I've seen before include "Moving slowly/steadily" , "Crawling quietly" , "Moving slowly with body near the ground" .)