With good visibility in seaside resorts, there's no apparent danger (3,5,2,5)
I believe the answer is:
the coast is clear
'there's no apparent danger' is the definition.
(phrase meaning it is safe)
'with good visibility in seaside resorts' is the wordplay.
I cannot really see how this works, but
'seaside' could be 'coast' (I've seen this before) and 'coast' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for the coast is clear that I've seen is " no one's about".)