Chief Barker? (3,3)
I believe the answer is:
top dog
'chief barker?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'chief barker?' is the wordplay.
'chief' becomes 'top' (synonyms).
'barker?' becomes 'dog' (I've seen this in another clue).
'top'+'dog'='TOP DOG'
Can you help me to learn more?
(Other definitions for top dog that I've seen before include "Canine in charge" , "Most important person (or winner at Crufts?)" , "Master or victor of canine hue" , "Not suitable" , "Boss" .)