The most common and most likely answer to this crossword clue is the 6 letter word HA-HAS
H
A
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H
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More clues leading to the result HA-HAS
Buddy explains!

The straight part
We know that "obstacles perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case obstacles perhaps = ha-has.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 HA-HAS mean?
HA-HAS noun- A laugh.
- Something funny; a joke.
- A ditch with one vertical side, acting as a sunken fence, designed to block the entry of animals into lawns and parks without breaking sightlines.