Cryptic crossword clue
Ultimately hide in cellar in disguise 7

The most common and most likely answer to this crossword clue is the 7 letter word ENCRYPT

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "disguise" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case disguise = encrypt.
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 ENCRYPT mean?

ENCRYPT verb
  1. To conceal information by means of a code or cipher.

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