Councillor slipping into spotted cloak (6)
I believe the answer is:
screen
'cloak' is the definition.
(I've seen this before)
'councillor slipping into spotted' is the wordplay.
I cannot really see how this works, but
'councillor' could be 'cr' (I've seen this in other clues) and 'cr' is found within the answer.
'spotted' could be 'seen' (spot can mean to see or notice) and 'seen' is found in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for screen that I've seen before include "Partition; test suitability" , "Movable partition - cinema" , "Show a motion picture (of)" , "Sieve; TV display" , "See 13" .)