Unusually able and accurate, welcoming a test of knowledge (13)
I believe the answer is:
baccalaureate
'test of knowledge' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'unusually able and accurate welcoming a' is the wordplay.
'unusually' indicates anagramming the letters.
'and' means one lot of letters go next to another.
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'able' after 'accurate' is 'accurateable'.
'accurateable' anagrammed gives 'baccalaurete'.
'baccalaurete' enclosing 'a' is 'BACCALAUREATE'.
Can you help me to learn more?
(Other definitions for baccalaureate that I've seen before include "Higher education exam" , "academic qualification" , "test result" , "Examination; diploma" , "French school-leaving exam" .)