What does the cryptic crossword clue "Diehard, both brute and louse, oddly? (4,4)" mean?

The wordplay uses an anagram. anagram of BRUTE (synonym="BRUTE") + LUE (synonym="LUE") = TRUEBLUE The answer is TRUEBLUE.

Diehard, both brute and louse, oddly? (4,4)

Guardian Cryptic #29641 | 3 Down | 2025-03-13 flower