Cryptic crossword clue
Circle date for invading and finding capacity 9

The most common and most likely answer to this crossword clue is the 9 letter word BANDWIDTH

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

The straight part
We know that "capacity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capacity = bandwidth.
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 BANDWIDTH mean?

BANDWIDTH noun
  1. The width, usually measured in hertz, of a frequency band.
  2. Of a signal, the width of the smallest frequency band within which the signal can fit.
  3. The rate of data flow in digital networks typically measured in bits per second; the bitrate.
  4. The capacity, energy or time required.

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