More courteous when one goes for a project (11)
I believe the answer is:
extrapolate
'for a project' is the definition.
(thesaurus)
'more courteous when one' is the wordplay.
I cannot quite understand how this works, but
'more' could be 'extra' (I've seen this before) and 'extra' is located in the answer.
'when' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
'one' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
The remaining letters 'plat' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'goes' acts as a link.
Can you help me to learn more?
(Other definitions for extrapolate that I've seen before include "forecast" , "Conclude from other data" , "Infer from what's known - to repeal tax (anag)" , "Infer further points from trends in data" .)