Cabin colleague has care of chart I submitted (7)
I believe the answer is:
copilot
'chart i submitted' is the definition.
I can't tell whether this definition defines the answer.
'cabin colleague has care of' is the wordplay.
'cabin colleague' becomes 'pilot' (I can't explain this - if you can you should give a lot more credence to this answer).
'has' means one lot of letters go next to another.
'care of' becomes 'co' (c/o can mean 'care of' when addressing mail).
'pilot' put after 'co' is 'COPILOT'.
Can you help me to learn more?
(Other definitions for copilot that I've seen before include "Airliner crew member" , "Second-in-command of aeroplane" .)