The most common and most likely answer to this crossword clue is the 10 letter word PROMENADES
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More clues leading to the result PROMENADES
Buddy explains!

The straight part
We know that "on the seafront" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case on the seafront = promenades.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 PROMENADES mean?
PROMENADES noun- A prom (dance).
- A walk taken for pleasure, display, or exercise; a stroll.
- A place where one takes a walk for leisurely pleasure, or for exercise, especially a terrace by the seaside.
- A dance motion consisting of a walk, done while square dancing.