Cryptic crossword clue
Subservient to western leadership? Not very impressive 13

The most common and most likely answer to this crossword clue is the 13 letter word UNDERWHELMING

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Buddy explains!

The straight part
We know that "Not very impressive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not very impressive = underwhelming.
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 UNDERWHELMING mean?

UNDERWHELMING adjective
  1. Failing to interest; not as exciting as promised or expected.

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