Cryptic crossword clue
Technically sound — if not, price must be adjusted 10

The most common and most likely answer to this crossword clue is the 10 letter word PROFICIENT

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

The straight part
We know that "Technically sound" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case technically sound = proficient.
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 PROFICIENT mean?

PROFICIENT noun
  1. An expert.
PROFICIENT adjective
  1. Good at something; skilled; fluent; practiced, especially in relation to a task or skill.

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