What does the cryptic crossword clue "Device on tree with pin broken (3-6)" mean?

The definition is "Device". The wordplay uses an anagram. anagram of ON + TREE + PIN = TIN-OPENER; definition: "Device" The answer is Tin-opener.

Device on tree with pin broken (3-6)

Telegraph Prize Cryptic #3021 | 28 Across | 2019-09-15 flower