Lean, slim (4)
I believe the answer is:
thin
I believe this is a double definition.
'lean' is the first definition.
(I know that lean can be written as thin)
'slim' is the second definition.
(I know that slim can be written as thin)
(Other definitions for thin that I've seen before include "Meagre" , "Spare" , "Implausible" , "Superficial" , "Carrying little fat" .)