Queen's back - meaning Queen record (8)
I believe the answer is:
register
'record' is the definition.
(register is a kind of record)
'queen's back meaning queen' is the wordplay.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'back' is a reversal indicator.
'meaning' becomes 'gist' (gist is a kind of meaning).
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'er' backwards is 're'.
're'+'gist'+'er'='REGISTER'
(Other definitions for register that I've seen before include "Obituary" , "Notice < book" , "Vocal compass" , "Show" , "Read" .)