Cryptic crossword clue
Finds fault with opening performances, but tenor must be good 6

The most common and most likely answer to this crossword clue is the 6 letter word DEBUGS

I've seen this crossword clue in Independent
D
E
B
U
G
S

Buddy explains!

The straight part
We know that "Finds fault" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case finds fault = debugs.
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 DEBUGS mean?

DEBUGS verb
  1. To search for and eliminate malfunctioning elements or errors in something, especially a computer program or machinery.
  2. To remove a hidden electronic surveillance device from (somewhere).
  3. To remove insects from (somewhere), especially lice.

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