Endless inducement to imprison fascist leader is a healthy sign (8)
I believe the answer is:
caduceus
'sign' is the definition.
(caduceus is a kind of sign)
'endless inducement to imprison fascist leader is a healthy' is the wordplay.
I cannot really understand how this works, but
'leader' could be 'duce' (Duce is an example) and 'duce' is present in the answer.
'a' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for caduceus that I've seen is " Serpentine staff having".)