Cryptic crossword clue
Increasing power of engine, one’s excluded from rallying 7

The most common and most likely answer to this crossword clue is the 7 letter word REVVING

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "Increasing power of engine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case increasing power of engine = revving.
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 REVVING mean?

REVVING verb
  1. To increase the speed of a motor, or to operate at a higher speed.
REVVING noun
  1. The act by which an engine is revved.
  2. A technique for reducing web page loading times by assigning far-future expiration dates to the resources on the page (so that the browser caches them indefinitely) and, if changes are needed, using different filenames for those resources.

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