Philosopher's true heart let down by society (7)

I believe the answer is:

russell

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'philosopher's' is the definition.
(Bertrand Russell)

'true heart let down by society' is the wordplay.
'heart' says to take the centre.
'let down' becomes 'sell' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'by' says to put letters next to each other.
'society' becomes 's' (common abbreviation in names of organisations).
The middle letters of 'true' are 'ru'.
'sell' after 's' is 'ssell'.
'ru'+'ssell'='RUSSELL'

Can you help me to learn more?

(Other definitions for russell that I've seen before include "Bertrand ___ , philosopher and mathematician, d. 1970" , "Victorian PM" , "He controversially filmed" , "See 2" , "Brand" .)

I've seen this clue in the Sydney Morning Herald.

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