Worn out army uniform needs alteration ultimately (8)
I believe the answer is:
fatigued
'worn out' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for fatigued that I've seen before include "Extremely tired" , "Exhausted" , "Tired, really weary" , "needing the rest" , "Drained of energy" .)