It's no good, at some stage, being worn (5)
I believe the answer is:
badge
'it's no good at some stage being worn' is the definition.
I can't judge whether this defines the answer.
'it's no good at some stage being' is the wordplay.
'it's no good' becomes 'bad' (similar in meaning).
'at' says to put letters next to each other.
'some stage being' becomes 'ge' (I can't justify this - if you can you should give a lot more credence to this answer).
'bad'+'ge'='BADGE'
Can you help me to learn more?
(Other definitions for badge that I've seen before include "Thing worn to show, say, membership of organisation" , "One cheating others with fictitious schemes" , "Distinguishing symbol" , "Worn emblem" , "Worn sign of membership or support" .)