Concurring about dog (3)
I believe the answer is:
cur
'dog' is the definition.
(a cur is an aggressive or scruffy dog)
'concurring about' is the wordplay.
'about' says the answer is hidden in the clue (the clue goes around or about the answer).
'CUR' is hidden within 'concurring'.
(Other definitions for cur that I've seen before include "Mangy dog" , "Mongrel - coward" , "Lowly dog" , "Useless dog" , "Miserable dog" .)