Unhealthy bird? (5)
I believe the answer is:
dicky
'unhealthy bird?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
This is all the clue.
Can you help me to learn more?
(Other definitions for dicky that I've seen before include "Unreliable" , "likely to fail" , "Rotten" , "tie" , "In precarious health - bird?" .)