Drunken soldier - tickly problem, lacking potassium (9)
I believe the answer is:
paralytic
'drunken' is the definition.
'soldier tickly problem lacking potassium' is the wordplay.
I cannot quite see how this works, but
'soldier' could be 'para' (paratrooper) and 'para' 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 paralytic that I've seen before include "Extremely drunk" , "Still" , "Drunk (informal)" .)