This is a cross-reference clue - the definition and wordplay are found in another clue in the grid (27 Across). You need to look at that clue to solve this one.
Find clue 27 Across in your grid. That clue will contain both the definition for this answer and the wordplay needed to construct it. The answer BALL will fit both this clue's position and relate to 27 Across.
Answer: BALL | This is a cross-reference where both the definition and wordplay are provided by clue 27 Across. The word BALL satisfies whatever definition and construction method is given in that referenced clue.