Told to pick sea sprite (5)

I believe the answer is:

pixie

I'm a little stuck... Click here to teach me more about this clue!

'sprite' is the definition.
(I know that pixie is a type of sprite)

I can't explain the rest of the clue.

(Other definitions for pixie that I've seen before include "Creature like fairy or elf" , "Small supernatural being in fairy tale" , "Pointy-eared dwarf" , "Small supernatural being in fairy tales" , "Elfin fairy" .)

I've seen this clue in the Sydney Morning Herald.

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