Cryptic crossword clue
… an old friend to invade country for takeover 10

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

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Buddy explains!

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

ANNEXATION noun
  1. Addition or incorporation of something, or territories that have been annexed.
  2. A legal merging of a territory into another body.

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