Copy Spain and Switzerland, love (4)
I believe the answer is:
Here is my best explanation:
'copy' is the definition.
'spain and switzerland love' is the wordplay.
'spain' becomes 'e' (abbreviation for Espana).
'and' is a charade indicator (letters next to each other).
'switzerland' becomes 'ch'.
'love' becomes 'o' (In tennis, 'love' means 'zero').
(Other definitions for echo that I've seen before include "Reflect in Czechoslovakia", "Close imitation", "parrot?", "Reproduction", "A natural sound reflection", "Send back", "In Roman mythology, the nymph who loved Narcissus", "repeated answer", "Reflected radar beam" and "Response".)