Poor dog with appendage possibly docked (9)
I believe the answer is:
curtailed
'docked' is the definition.
(I've seen this before)
'poor dog with appendage' is the wordplay.
'poor dog' becomes 'cur' (I've seen this before).
'with' says to put letters next to each other.
'appendage' becomes 'tailed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cur'+'tailed'='CURTAILED'
'possibly' acts as a link.
Can you help me to learn more?
(Other definitions for curtailed that I've seen before include "docked" , "limited" , "Clipped" , "Reduced" , "Cut short" .)