What does the cryptic crossword clue "Sole U.S. trainee for deployment when it suits (2,4,7)" mean?

The wordplay uses an anagram. anagram of SOLE + U.S. + TRAINEE = ATONESLEISURE The answer is ATONESLEISURE.

Sole U.S. trainee for deployment when it suits (2,4,7)

Daily Mail Cryptic #17473 | 19 Across | 2024-10-23 flower