Policeman penning note such as could be disputed (11)
I believe the answer is:
contestable
'could be disputed' is the definition.
I can't judge whether this definition defines the answer.
'policeman penning note such' is the wordplay.
'policeman' becomes 'constable' (I've seen this before).
'penning' means one lot of letters goes inside another.
'note such' becomes 'te' (musical note. I am not sure about the 'such' bit.).
'constable' going around 'te' is 'CONTESTABLE'.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for contestable that I've seen before include "Not taken as gospel" , "open to challenge" , "open to question" , "could be challenged" .)