Cryptic crossword clue
Strengthen the borders after rebels capture northern port

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

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "Strengthen" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case strengthen = invigorate.
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 INVIGORATE mean?

INVIGORATE verb
  1. To impart vigor, strength, or vitality to.
  2. To heighten or intensify.
  3. To give life or energy to.
  4. To make lively.

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