What does the cryptic crossword clue "Castaway gloated in this way, we're told (6)" mean?

The definition is "Castaway". The wordplay uses a homophone (sounds like). Sounds like CREW SO. The answer is CRUSOE.

Castaway gloated in this way, we're told (6)

Times Cryptic #28699 | 21 Down | 2023-09-04 flower