Loose rock formation in dangerous creek (5)
I believe the answer is:
scree
'loose rock' is the definition.
(I've seen this before)
'in dangerous creek' is the wordplay.
'in' indicates a hidden word.
'SCREE' is hidden within 'dangerous creek'.
'formation' is the link.
This may not be correct. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for scree that I've seen before include "Loose shifting stones" , "Mass of loose stones on a mountain" , "Loose stones around a mountain" , "Rock fragments at cliff foot" , "Safeguard" .)