Cryptic crossword clue
It contracts to continue one’s circulation 7

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

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

The straight part
We know that "It contracts to continue one’s circulation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it contracts to continue one’s circulation = systole.
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 SYSTOLE mean?

SYSTOLE noun
  1. The rhythmic contraction of the heart, by which blood is driven through the arteries.
  2. A shortening of a naturally long vowel.

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