What does the cryptic crossword clue "Junk in window, a steal (5)" mean?

The definition is "Junk". The wordplay uses a hidden word. Hidden in "junk in windoW, A STEal" The answer is Waste.

Junk in window, a steal (5)

Telegraph Prize Cryptic #3086 | 12 Across | 2020-12-13 flower