The most common and most likely answer to this crossword clue is the 8 letter word FATIGUES
I've seen this crossword clue in Financial Times
F
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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 FATIGUES mean?
FATIGUES noun- A weariness caused by exertion; exhaustion.
- (often in the plural) A menial task or tasks, especially in the military.
- Material failure, such as cracking or separation, caused by stress on the material.
- To tire or make weary by physical or mental exertion
- To wilt a salad by dressing or tossing it
- To lose so much strength or energy that one becomes tired, weary, feeble or exhausted
- (of a material specimen) to undergo the process of fatigue; to fail as a result of fatigue.
- Menial duties, especially as punishment.
- Military clothing worn when doing menial tasks.