Concerning drink rumour (6)
I believe the answer is:
report
'rumour' is the definition.
(I've seen this before)
'concerning drink' is the wordplay.
'concerning' becomes 're'.
'drink' becomes 'port' (port is a kind of drink).
're'+'port'='REPORT'
(Other definitions for report that I've seen before include "Inform on - official statement" , "Sudden noise; account of progress" , "Inform about the sound of thegun" , "Account, story" , "Teacher's assessment" .)