What does the cryptic crossword clue "A trapper's mislaid extra piece of equipment (5,4)" mean?

The wordplay uses an anagram. anagram of A + TRAPPER'S = SPAREPART The answer is SPAREPART.

A trapper's mislaid extra piece of equipment (5,4)

Daily Mail Cryptic #16991 | 5 Down | 2022-12-16 flower