Ill-mannered dog (3)
(Other definitions for cur that I've seen before include "Wretch" , "Aggressive mongrel" , "Worthless or bad-tempered dog" , "Vile dog" , "Mongrel - coward" .)
'dog?' is the definition.
(pointer is a kind of dog)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for pointer that I've seen before include "Hint (for a dog?)" , "Arrow" , "Gun dog" , "helpful tip!" , "Sign" .)