Document showing achievement of consul? Not completely (7)
I believe the answer is:
diploma
'document showing achievement' is the definition.
'diploma' can be an answer for 'document' (diploma can mean a document). I'm unsure of the 'showing achievement' bit.
'consul? not completely' is the wordplay.
'consul?' becomes 'diplomat' (consul is a kind of diplomat).
'not completely' means to remove the last letter (the word is incomplete).
'diplomat' with its final letter taken off is 'DIPLOMA'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for diploma that I've seen before include "Document conferring a qualification" , "Paper showing examination success" , "Exam certificate" , "Certificate awarded by college for educational attainment" , "Certificate of achievement" .)