Tees is for ambassador abandoning urgent upgrade (11)
I believe the answer is:
improvement
'upgrade' is the definition.
(I've seen this before)
'tees is for ambassador abandoning urgent' is the wordplay.
I cannot quite understand how this works, but
'for' could be 'pro' (I've seen this before) and 'pro' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for improvement that I've seen before include "recovery" , "A change for the better" , "Upgrade" , "Act of making better" , "upgrading" .)