Word after "surface" or "gray" (4)
I believe the answer is:
area
'word after surface or gray' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for area that I've seen before include "part of town" , "Territory" , "Field -- expanse" , "Speaking formally to (someone)" , "Extent of a two-dimensional surface" .)