$1,000 seal, please (7)
I believe the answer is:
Here is my best explanation:
'please' is the definition.
'$1000 seal' is the subsidiary indication.
'$g000' becomes 'g' (I can't explain this - if you can you should give a lot more credence to this answer).
'seal' becomes 'ratify'.
(Other definitions for gratify that I've seen before include "Give pleasure to", "Indulge (a desire)" and "Please - indulge".)