Tell nobleman (5)
I believe the answer is:
count
This clue is a double definition.
'tell' is the first definition.
(I've seen this before)
'nobleman' is the second definition.
(count is a kind of nobleman)
(Other definitions for count that I've seen before include "Cut some ice" , "Tolstoy was one" , "Sum up" , "Nobleman - tell how many" , "earl abroad" .)