Policeman facing a long cycle is undecided (9)
I believe the answer is:
dithering
'cycle is undecided' is the definition.
I can't judge whether this defines the answer.
'policeman facing a long' is the wordplay.
'policeman' becomes 'di' (abbreviation for Detective Inspector).
'facing' means one lot of letters go next to another.
'a long' becomes 'thering' (I am not sure about this - if you are sure you should believe this answer much more).
'di'+'thering'='DITHERING'
Can you help me to learn more?
(Other definitions for dithering that I've seen before include "Flapping, hesitating" , "in a tizzy" , "Being indecisive" .)