What does the cryptic crossword clue "Polish expert (4)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Polish expert (4)

Guardian #3887 | 2 Down | 2021-04-11 flower

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Also seen in

Telegraph Prize Cryptic #3189 (2022-12-04) Telegraph #28594 (2017-11-25)