Timely restriction on a dog with hardly any tail (6)
I believe the answer is:
curfew
'timely restriction' is the definition.
'curfew' can be an answer for 'restriction' (I've seen this before). I'm not sure about the 'timely' bit.
'on a dog with hardly any tail' is the wordplay.
'on' means one lot of letters go next to another.
'a dog' becomes 'cur' (both can mean a despicable person).
'with hardly any tail' becomes 'few' (I am not sure about this - if you are sure you should believe this answer much more).
'cur' put next to 'few' is 'CURFEW'.
Can you help me to learn more?
(Other definitions for curfew that I've seen before include "Early bedtime imposed by military" , "Order to be off the streets by a certain hour" , "Order restricting time not at home" , "when it's time to go home" , "Restriction on going out" .)