Reveal record waste? (8)
I believe the answer is:
disclose
'reveal' is the definition.
(disclosing is a kind of revealing)
'record waste?' is the wordplay.
'record' becomes 'disc' ('disc' can be a synonym of 'record').
'waste?' becomes 'lose'.
'disc'+'lose'='DISCLOSE'
(Other definitions for disclose that I've seen before include "Divulge, reveal" , "Make known - subject is closed" , "Uncover" , "Make public" , "Divulge or expose" .)