£1,000 -- magnificent! (5)
I believe the answer is:
grand
'magnificent' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for grand that I've seen before include "Large and imposing" , "1000, colloquially" , "Type of piano" , "PS1000 (sl.)" , "Majestic" .)