Report girl above weight (8)
I believe the answer is:
announce
'report' is the definition.
(I've seen this before)
'girl above weight' is the wordplay.
'girl' becomes 'ann' (woman's name).
'above' means one lot of letters go next to another (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" .)