Cryptic crossword clue
Marine guards Queen, returning debt that will grow massively 7

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

I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "that will grow massively" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that will grow massively = sequoia.
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 SEQUOIA mean?

SEQUOIA noun
  1. Sequoiadendron giganteum, a coniferous evergreen tree formerly in the genus Sequoia, now placed in Sequoiadendron.
  2. Sequoia sempervirens, a coniferous evergreen tree, the only living species of the genus Sequoia.

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