Individual involved with soldier can become malnourished (5)
I believe the answer is:
human
'individual' is the definition.
('human' can be a synonym of 'individual')
'involved with soldier can become malnourished' is the wordplay.
I cannot quite see how this works, but
'soldier' could be 'man' (I've seen this before) and 'man' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for human that I've seen before include "Of the species of homo sapiens" , "Not divine, animal or mechanical" , "Like a real person" , "Like people" , "Relating to mankind" .)