She's clearly big-hearted! (4)

I believe the answer is:

rosa

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'she's' is the definition.

'clearly big-hearted' is the wordplay.
'clearly' becomes 'ros' (I can't justify this - if you can you should give a lot more credence to this answer).
'big' becomes 'bad' (synonyms).
'hearted' says to take the centre.
The middle of 'bad' is 'a'.
'ros'+'a'='ROSA'

Can you help me to learn more?

(Other definitions for rosa that I've seen before include "Sub .... - in confidence" , "Parks" .)

I've seen this clue in the Evening Standard.

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