Black in outskirts of Keighley (4)
I believe the answer is:
inky
'black' is the definition.
(similar in meaning)
'in outskirts of keighley' is the wordplay.
'outskirts of' says to hollow out the word (remove centre letters) (only letters on the outskirts).
'keighley' with its middle taken out is 'ky'.
'in'+'ky'='INKY'
(Other definitions for inky that I've seen before include "Leaked on by pen" , "Marked by leaky pen" , "Black as pen fluid?" , "Pitch-black" , "Black; drunk (Aus. sl.)" .)