It's in advance, naturally (3)

I believe the answer is:

van

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

'it's' is the definition.
I can't tell whether this defines the answer.

'in advance naturally' is the wordplay.
'in' indicates a hidden word.
'VAN' can be found hidden inside 'advance naturally'.

Can you help me to learn more?

(Other definitions for van that I've seen before include "Pantechnicon" , "Goods vehicle" , ". . . Morrisson (singer)" , "Commercial vehicle at head of army" , "Light vehicle" .)

I've seen this clue in the Evening Standard.

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