What does the cryptic crossword clue "Stick unusually hard with twice the initial efficiency (6)" 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.

Stick unusually hard with twice the initial efficiency (6)

Guardian Cryptic #26634 | 19 Down | 2015-07-27

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