Report girl above weight (8)
I believe the answer is:
announce
'report' is the definition.
(I know that report is a more specific form of announce)
'girl above weight' is the wordplay.
'girl' becomes 'ann' (woman's name).
'above' is a charade indicator (letters next to each other) (in a down clue, some letters go above others).
'weight' becomes 'ounce' (unit of weight).
'ann'+'ounce'='ANNOUNCE'
(Other definitions for announce that I've seen before include "Disclose" , "Tell everyone" , "Publicise" , "Report" , "Reveal" .)