One that's imitating diva, framing 'Love' with Red Heart on top (6)

I believe the answer is:

echoer

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'top' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

'one that's imitating diva framing love with red heart' is the wordplay.
'one that's imitating diva' becomes 'cher' (I am not sure about this - if you are sure you should believe this answer much more).
'framing' indicates putting letters inside.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'with' says to put letters next to each other.
'heart' says to take the centre.
The middle letter of 'red' is 'e'.
'cher' going around 'o' is 'choer'.
'choer' after 'e' is 'ECHOER'.

'on' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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