Slender, thin (4)
I believe the answer is:
slim
I believe this clue is a double definition.
'slender' is the first definition.
(synonyms)
'thin' is the second definition.
(synonyms)
(Other definitions for slim that I've seen before include "Svelte" , "insufficient" , "Slenderly built" , "Slender and elegant" , "Slender or slight" .)