The most common and most likely answer to this crossword clue is the 8 letter word KILOBYTE
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The straight part
We know that "1000 bits" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 1000 bits = kilobyte.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 KILOBYTE mean?
KILOBYTE noun- (especially RAM) A unit of storage capacity, equal to 1024 (210) bytes : a kibibyte. Frequently abbreviated KB.
- 1000 (103) bytes. SI Symbol: kB