Report concerning: delayed (6)
I believe the answer is:
relate
'report' is the definition.
(I've seen this before)
'concerning delayed' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'delayed' becomes 'late' (I've seen this in another clue).
're'+'late'='RELATE'
(Other definitions for relate that I've seen before include "Narrate or associate" , "Connect in Tralee" , "how to get on?" , "Recite - marriage guidance organisation" , "Sympathise" .)