Crossword Genius

Walk in the park to eat out (6)

Ross

I believe the answer is:

picnic

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'eat out' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for picnic that I've seen before include "Eat out" , "Outdoor snack" , "Informal meal in open air for pleasure" , "Meal eaten outside" , "external courses?" .)

I've seen this clue in The Times.
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