Cryptic crossword clue
Agree to keep old tank mainly for one of our relatives 10

The most common and most likely answer to this crossword clue is the 10 letter word CHIMPANZEE

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

The straight part
We know that "one of our relatives" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one of our relatives = chimpanzee.
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 CHIMPANZEE mean?

CHIMPANZEE noun
  1. A species of great ape in the genus Pan, native to Africa, and believed by biologists to be the closest extant relative to humans.

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