What does the cryptic crossword clue "I'm after whiskey shot that goes right through one (4)" mean?

The definition is "I'm after whiskey shot that goes right through one". The wordplay uses a double definition. Double definition The answer is XRAY.

I'm after whiskey shot that goes right through one (4)

Independent Cryptic #12073 | 24 Down | 2025-06-19 flower