What does the cryptic crossword clue "Old British soldier redeployed to cadre (7)" mean?

The definition is "Old". The wordplay uses an anagram. anagram of TO + CADRE = REDCOAT; definition: "Old British soldier" The answer is Redcoat.

Old British soldier redeployed to cadre (7)

Telegraph Prize Cryptic #3071 | 26 Across | 2020-08-30 flower