What does the cryptic crossword clue "Pole enters by way of a special permit (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.

Pole enters by way of a special permit (4)

Guardian Cryptic #26813 | 22 Down | 2016-02-22 flower

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