Chromium enduring, not potassium? Suspicious behaviour (8)
I believe the answer is:
creeping
'enduring not potassium? suspicious behaviour' is the definition.
I can't judge whether this defines the answer.
'chromium' is the wordplay.
I cannot really understand how this works, but
'chromium' could be 'cr' (chemical symbol) and 'cr' is present 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" .)