The most common and most likely answer to this crossword clue is the 6 letter word ASCENT
I've seen this crossword clue in Independent
A
S
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Buddy explains!

The straight part
We know that "17 turned up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 17 turned up = ascent.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 ASCENT mean?
ASCENT noun- The act of ascending; a motion upwards.
- The way or means by which one ascends.
- An eminence, hill, or high place.
- The degree of elevation of an object, or the angle it makes with a horizontal line; inclination; rising grade.
- The ascender height in a typeface.
- An increase, for example in popularity or hierarchy