Nobleman to be included in calculations (5)

I believe the answer is:

count

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'nobleman' is the definition.
(I know that count is a type of nobleman)

I can't explain the rest of the clue.

(Other definitions for count that I've seen before include "twenty three [NOBLE] from abroad" , "Determine number of; foreign nobleman" , "Add up" , "Matter to consider" , "Include; nobleman" .)

I've seen this clue in The Irish Independent.

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