Called for more to come from the heart, ultimately? (7)

I believe the answer is:

encored

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'called for' is the definition.
(encoring is a kind of calling for)

I cannot understand how the rest of the clue works.

(Other definitions for encored that I've seen before include "Red cone (anag.)" , "Asked to repeat" .)

I've seen this clue in The Independent.

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