This is a charade - multiple word parts are joined together in sequence to form the final answer.
Start with a word meaning 'fling' or 'throw'. Then take the word 'glee' and make it 'naked' by removing its outer letters (first and last). Put these parts together in order.
Answer: CASTLE | CAST (fling/throw) + LE (glee with outer letters g and e removed, making it 'naked'). In chess, castling is a move to try and cover/protect the King.