What does the cryptic crossword clue "Stupidly select old bayonet (4,5)" mean?

The definition is "bayonet". The wordplay uses an anagram. anagram of SELECT OLD = COLDSTEEL The answer is COLDSTEEL.

Stupidly select old bayonet (4,5)

Guardian Cryptic #29614 | 4 Down | 2025-02-10 flower