Ordnance Survey spread out in Barnes & Noble (8)
I believe the answer is:
baroness
'noble' is the definition.
(I know that baroness is a type of noble)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for baroness that I've seen before include "Noble" , "Titled lady" , "Female life peer" , "Aristocrat" , "Lady Thatcher?" .)