Portion of aspic, nice to eat outside (6)

I believe the answer is:

picnic

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'eat outside' is the definition.
'picnic' can be an answer for 'eat' (picnicking is a kind of eating). I'm not sure about the 'outside' bit.

'portion of aspic nice to' is the wordplay.
'portion of' indicates a hidden word.
'PICNIC' can be found hidden inside 'aspic nice to'.

Can you help me to learn more?

(Other definitions for picnic that I've seen before include "external courses?" , "Easy task - outdoor event" , "outing" , "Outdoor repast" , "Do without" .)

I've seen this clue in The Times.

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