What does the cryptic crossword clue "Celebrities dropping litter at Ickworth House (10)" mean?

The definition is "Celebrities". The wordplay uses a hidden word. hidden in "dropping litter at Ickworth" The answer is GLITTERATI.

Celebrities dropping litter at Ickworth House (10)

Guardian Cryptic #26976 | 24 Across | 2016-08-30 flower