$1,000 seal, please (7)
I believe the answer is:
gratify
'please' is the definition.
(thesaurus)
'$1000 seal' is the wordplay.
'$g000' becomes 'g' (I can't justify this - if you can you should give a lot more credence to this answer).
'seal' becomes 'ratify'.
'g'+'ratify'='GRATIFY'
(Other definitions for gratify that I've seen before include "Give pleasure to" , "Indulge (a desire)" , "Please - indulge" .)