Crossword Genius

In case one's ordering veal to take out (6)

Ross

I believe the answer is:

valise

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

'in case' is the definition.
'valise' can be an answer for 'case' (I've seen this before). I am not sure about the 'in' bit.

'one's ordering veal to take out' is the wordplay.
I cannot quite understand how this works, but
'one's' could be 'is' (Roman numeral) and 'is' is located in the answer.
an anagram of 'veal' is 'vale' which is located in the left over letters.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for valise that I've seen before include "Small overnight bag" , "Small travelling bag or suitcase" , "Travel bag" , "Elvis A? (anag)" , "A small suitcase for Leavis" .)

I've seen this clue in the Evening Standard.
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