Crossword Genius

Thank director, who reportedly surveys aquatic larvae? (8)

Ross

I believe the answer is:

tadpoles

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'larvae?' is the definition.
(I know this)

I can't explain the rest of the clue.

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(Other definitions for tadpoles that I've seen before include "Baby frogs" , "Immature frogs" , "Little swimmers" , "Young frogs" , "Larvae of frogs or toads" .)

I've seen this clue in The Irish Times.
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