Cryptic crossword clue
Ad-lib, using energy and variable increase in speed 11

The most common and most likely answer to this crossword clue is the 11 letter word EXTEMPORISE

I've seen this crossword clue in The Times
E
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Buddy explains!

The straight part
We know that "Ad-lib" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ad-lib = extemporise.
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 EXTEMPORISE mean?

EXTEMPORISE verb
  1. To do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise.
  2. To do something in a makeshift way.
  3. To make or create extempore.
  4. To compose extemporaneously or improvise.

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