Key worker in army uniform (8)
I believe the answer is:
wardress
'key worker' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'army uniform' is the wordplay.
'army' becomes 'war' (I can't explain this - if you can you should give a lot more credence to this answer).
'uniform' becomes 'dress' (dress uniform is a kind of uniform).
'war'+'dress'='WARDRESS'
'in' is the link.
Can you help me to learn more?
(Other definitions for wardress that I've seen before include "guard?" , "Female prison officer" .)