All you have to cook things in? (3)

I believe the answer is:

pan

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'cook things in?' is the definition.
'Pan' can be an answer for 'cook' (thesaurus). I'm not sure about the 'things in?' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for pan that I've seen before include "all in many words, initially" , "Prefix denoting all, continent or world" , "Roast" , "A vessel; chimp genus" , "Toilet bowl" .)

I've seen this clue in the Evening Standard.

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