Cryptic crossword clue
Fully secure, like empty areas in hideouts for moles 2,4,2,6

The most common and most likely answer to this crossword clue is the 2 plus 4 plus 2 plus 6 letter word AS SAFE AS HOUSES

I've seen this crossword clue in Financial Times
A
S
S
A
F
E
A
S
H
O
U
S
E
S

Buddy explains!

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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