Fail to honour Britons (5)
I believe the answer is:
welsh
This clue might be a double definition.
'fail' is the first definition.
The definition and answer can be both to do with social activities as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'honour britons' is the second definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'to' acts as a link.
Can you help me to learn more?
(Other definitions for welsh that I've seen before include "Dresser, harp or rabbit" , "tongue" , "Of bookie, decamp without paying out winnings" , "Cymric" , "So-called rabbit" .)