The most common and most likely answer to this crossword clue is the 6 plus 1 letter word HASTE} –
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Buddy explains!
The straight part
We know that "furious activity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case furious activity = haste} –.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 HASTE} – mean?
HASTE} – noun- Speed; swiftness; dispatch.
- Urgency; sudden excitement of feeling or passion; precipitance; vehemence.
- To urge onward; to hasten.
- To move with haste.