Cryptic crossword clue
Regressive Exeter University squeezes come into effect 5

The most common and most likely answer to this crossword clue is the 5 letter word INURE

I
N
U
R
E


Buddy explains!

The straight part
We know that "come into effect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case come into effect = inure.
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 INURE mean?

INURE verb
  1. To cause someone to become accustomed to something (usually) unpleasant.
  2. To take effect, to be operative.
  3. To commit.

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