The most common and most likely answer to this crossword clue is the 5 letter word HIGHS
I've seen this crossword clue in The Guardian
H
I
G
H
S
Buddy explains!

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 HIGHS mean?
HIGHS noun- A high point or position, literally or figuratively; an elevated place; a superior region; a height; the sky; heaven.
- A point of success or achievement; a time when things are at their best.
- A period of euphoria, from excitement or from an intake of drugs.
- A drug that gives such a high.
- A large area of elevated atmospheric pressure; an anticyclone.
- The maximum value attained by some quantity within a specified period.
- The maximum atmospheric temperature recorded at a particular location, especially during one 24-hour period.
- The highest card dealt or drawn.
- Thought; intention; determination; purpose.