The most common and most likely answer to this crossword clue is the 7 letter word ATTENDS
I've seen this crossword clue in The Daily Telegraph
A
T
T
E
N
D
S
More clues leading to the result ATTENDS
Buddy explains!

The straight part
We know that "Turns up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case turns up = attends.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 ATTENDS mean?
ATTENDS verb- To set on fire; kindle.
- To take or catch fire.
- To listen to (something or someone); to pay attention to; regard; heed.
- To listen (to, unto).
- To turn one's consideration (to); to deal with (a task, problem, concern etc.), to look after.
- To wait upon as a servant etc.; to accompany to assist (someone).
- To be present at (an event or place) in order to take part in some action or proceedings; to regularly go to (an event or place).
- To go to (a place) for some purpose (with at).
- To be present with; to accompany; to be united or consequent to.
- To wait for; to await; to remain, abide, or be in store for.