Cryptic crossword clue
Allows real changes in better systems 9

The most common and most likely answer to this crossword clue is the 9 letter word TOLERATES

I've seen this crossword clue in The Daily Telegraph
T
O
L
E
R
A
T
E
S

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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 TOLERATES mean?

TOLERATES verb
  1. To accept hardship without objection.

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