Checked gold key got tied off (7)
I believe the answer is:
audited
'checked' is the definition.
(I've seen this before)
'gold key got tied off' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'key' becomes 'd' (musical key).
'got' indicates putting letters inside.
'off' indicates anagramming the letters.
'au'+'d'='aud'
'tied' with letters rearranged gives 'dite'.
'aud' placed around 'dite' is 'AUDITED'.
(Other definitions for audited that I've seen before include "Checked books" , "not cooked?" , "Examined (accounts)" , "Checked (someone's accounts)" , "officially checked" .)