The most common and most likely answer to this crossword clue is the 11 letter word BOTTLENECKS
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More clues leading to the result BOTTLENECKS
Buddy explains!

The straight part
We know that "Impediments" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case impediments = bottlenecks.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 BOTTLENECKS mean?
BOTTLENECKS noun- The narrow portion that forms the pouring spout of a bottle; the neck of a bottle.
- In traffic, any narrowing of the road, especially resulting in a delay.
- (by extension) The part of a process that is too slow or cumbersome.
- To slow by causing a bottleneck.
- To form a bottleneck.