Unconventional — like a retired policeman? (7)
I believe the answer is:
offbeat
'unconventional' is the definition.
(similar in meaning)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for offbeat that I've seen before include "Strikingly unconventional" , "Bohemian" , "Odd, unconventional" , "Unconventional or lacking rhythm" , "rather unorthodox" .)