Zany dance for prison guards? (9)
I believe the answer is:
screwball
'zany' is the definition.
(I've seen this before)
'dance for prison guards?' is the wordplay.
'dance' becomes 'ball' (ball is a kind of dance).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'prison guards?' becomes 'screw' (I can't explain this - if you can you should give a lot more credence to this answer).
'ball' after 'screw' is 'SCREWBALL'.
Can you help me to learn more?
(Other definitions for screwball that I've seen before include "Zany" , "touched person" , "odd fellow?" , "Crazy American" , "Wacky" .)