Eating here is no picnic (7)

I believe the answer is:

indoors

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'eating here' is the definition.
Both the answer and definition are adverbs. Maybe you can see an association between them that I can't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for indoors that I've seen before include "Within house" , "Within the four walls" , "Within a building" , "under cover" , "safe from the weather" .)

I've seen this clue in The Globe and Mail.

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