The most common and most likely answer to this crossword clue is the 7 letter word PICK-UP
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Buddy explains!

The straight part
We know that "van" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case van = pick-up.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PICK-UP mean?
PICK-UP noun- An electronic device for detecting sound, vibration, etc., such as one fitted to an electric guitar or record player.
- A pickup truck.
- (usually attributive) Impromptu or ad hoc, especially of sports games and teams made up of randomly selected players.
- An instance of approaching someone and engaging in romantic flirtation and courting with the intent to pursue romance, a date, or a sexual encounter. See also pick-up line, pick-up joint, pickup artist.
- A person successfully approached in this manner for romance or sex.
- In various games, the fielding or hitting of a ball just after it strikes the ground.
- An item that can be picked up by the player, conferring some benefit or effect; a power-up.
- The act of a challenging party or candidate winning an electoral district held by an incumbent party or candidate. See also gain
- The act of answering a telephone.
- A relatively minor shot filmed or recorded after the fact to augment previous footage.
- The act of collecting and taking away something or someone, usually in a vehicle.