Mention location in report (4)
I believe the answer is:
cite
'mention' is the definition.
(to cite is to mention or quote)
'location in report' is the wordplay.
'location' becomes 'site' (site is a kind of location).
'in report' indicates a 'sounds like' (homophone) clue (ie reportedly, we hear).
'site' is a homophone of 'CITE'.
(Other definitions for cite that I've seen before include "for instance" , "Summon - quote" , "Quote as authority" , "Quote as an example or in support" , "Repeat a passage from some written work" .)