Dogged saint? (7)
I believe the answer is:
bernard
'saint?' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for bernard that I've seen before include "St - - , dog" , "Saintly dog and department store brand" , "Sainted dog for the mountains" , "Saint - - , dog" .)