The most common and most likely answer to this crossword clue is the 9 letter word BOARDWALK
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Buddy explains!
The straight part
We know that "path on/seafront" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case path on/seafront = boardwalk.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 BOARDWALK mean?
BOARDWALK noun- A slightly elevated path for pedestrians over sandy or swampy ground, typically made out of wood; specifically one running alongside a body of water or beach.
- To install a boardwalk over.