Cryptic crossword clue
Unlimited entry as a caller’s case is re-examined 6,3,5

The most common and most likely answer to this crossword clue is the 6 plus 3 plus 5 letter word ACCESS ALL AREAS

I've seen this crossword clue in Financial Times
A
C
C
E
S
S
A
L
L
A
R
E
A
S

Buddy explains!

The straight part
We know that "Unlimited entry" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unlimited entry = access all areas.
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.

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