The most common and most likely answer to this crossword clue is the 5 plus 2 letter word STAND UP
I've seen this crossword clue in Independent
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More clues leading to the result STAND UP
Buddy explains!

The straight part
We know that "Rise/wash" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rise/wash = stand 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 STAND UP mean?
STAND UP noun- A performance of stand-up comedy; jokes delivered standing on a stage
- A comedian who performs on stage.
- A short meeting performed while standing up.
- A free-standing photographic print or promotional item; a standee.
- Honest; honorable.
- Upright; while standing.
- Performed while standing although normally done while sitting.
- (of a hit) That allows the batter to advance to a given base (usually second or third) without having to slide.