The most common and most likely answer to this crossword clue is the 8 letter word CORNICHE
I've seen this crossword clue in The Times
C
O
R
N
I
C
H
E
More clues leading to the result CORNICHE
- Chronic crashes on eastern coast road
- Roller signalled by my unrivalled place in the market
- Company runs hotel in pleasant coastal road
- My husband blocks pleasant cliff-top road
- My specialism is building a coastal road
- Roller seen along the coast road by a cliff face
- Roller? Once rich, in another way
- My special spot on coast road
- Gosh! Cosy place is visible from coastal road
- Coast road‘s my special place
Buddy explains!

The straight part
We know that "coastal road" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case coastal road = corniche.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 CORNICHE mean?
CORNICHE noun- A road built on a ledge (cliff), especially along water (a river, sea, etc).