Trouble at start of career (4)
I believe the answer is:
care
This could be a double definition.
'trouble' is the first definition.
(thesaurus)
'start of career' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'at' acts as a link.
Can you help me to learn more?
(Other definitions for care that I've seen before include "Prudence" , "Happy-go-lucky" , "Have concern or regard" , "Protective custody" , "Race (anag.)" .)