Cryptic crossword clue
Tungsten’s estimated to keep most rigid 7

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

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Buddy explains!

The straight part
We know that "most rigid" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most rigid = tensest.
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 TENSEST mean?

TENSEST adjective
  1. Showing signs of stress or strain; not relaxed.
  2. Pulled taut, without any slack.

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