Four out of five chosen for answer (4)

I believe the answer is:

echo

I'm a little stuck... Click here to teach me more about this clue!

'answer' is the definition.
(thesaurus)

'four out of five chosen' is the wordplay.
'ECHO' is hidden within the letters.
But, I'm not sure how the hidden word is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for echo that I've seen before include "Close imitation" , "one catches on the rebound?" , "from Brussels?" , "Greek nymph, spurned by Narcissus, who pined away until only her voice remained" , "Reflected sound" .)

I've seen this clue in The Telegraph.

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