Showing a possible hint of undernourishment (4)
I believe the answer is:
thin
'showing a' is the definition.
I can't tell whether this defines the answer.
'possible hint of undernourishment' is the wordplay.
'hint' can be anagrammed to 'THIN'.
However, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for thin that I've seen before include "Meagre" , "Flimsy" , "Slender, slight" , "Dilute; lean" , "Made of light material" .)