Gold, Sarkozy's said, seen in financial check (5)
I believe the answer is:
audit
'financial check' is the definition.
(I've seen this before)
'gold sarkozy's said' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'sarkozy's said' becomes 'dit' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'au'+'dit'='AUDIT'
'seen in' acts as a link.
Can you help me to learn more?
(Other definitions for audit that I've seen before include "Financial check" , "Inspection of records" , "Formally examine" , "Investigate" , "Go over" .)