They're highly visible coming back from the esplanade (4)
I believe the answer is:
alps
'they're highly visible coming' is the definition.
The definition suggests an adverb but the answer is not.
'back from the esplanade' is the wordplay.
'back' says the letters should be written in reverse.
'from' indicates the answer is hidden within the clue.
'spla' is hidden in the letters of 'esplanade'.
'spla' back-to-front is 'ALPS'.
Can you help me to learn more?
(Other definitions for alps that I've seen before include "high areas" , "High mountains" , "Slap about in mountains" , "high points" , "Laps around mountains" .)