Dark end of mall in part of industrial estate (5)
I believe the answer is:
unlit
'dark' is the definition.
('unlit' can be similar in meaning to 'dark')
'end of mall in part of industrial estate' is the wordplay.
'end of' indicates one should take the final letters.
'in' means one lot of letters goes inside another.
'part of industrial estate' becomes 'unit'.
The last letter of 'mall' is 'l'.
'l' inserted within 'unit' is 'UNLIT'.
(Other definitions for unlit that I've seen before include "With no lighting" , "Left in the dark" , "Not yet burning" , "Lacking illumination" , "Shadowy" .)