Cryptic crossword clue
For energy, limits the amount of rapid increases 14

The most common and most likely answer to this crossword clue is the 14 letter word PROLIFERATIONS

I've seen this crossword clue in The Daily Telegraph
P
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Buddy explains!

The straight part
We know that "rapid increases" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rapid increases = proliferations.
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.

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