Be accredited as a nobleman (5)
I believe the answer is:
count
'nobleman' is the definition.
(count is a kind of nobleman)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for count that I've seen before include "Nobleman - tell how many" , "regard" , "Cut some ice" , "twenty three [NOBLE] from abroad" , "Reckon" .)