Cryptic crossword clue
Internally shortens or straightens muscles 7

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

T
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Buddy explains!

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

TENSORS noun
  1. A muscle that stretches a part, or renders it tense.
  2. A mathematical object that describes linear relations on scalars, vectors, matrices and other tensors, and is represented as a multidimensional array.
  3. A norm operation on the quaternion algebra.
TENSORS verb
  1. To compute the tensor product of two tensors.

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