What does the cryptic crossword clue "Create extra strain for a biologist (5-9)" 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.

Create extra strain for a biologist (5-9)

Guardian Cryptic #21984 | 1 Across | 2000-08-23

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