Capital raised in rupees source of endless regret (7)

I believe the answer is:

remorse

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'regret' is the definition.
(remorse is a feeling of regret)

'capital raised in rupees source of endless' is the wordplay.
'capital raised in' becomes 'remo' (I can't justify this - if you can you should believe this answer much more).
'rupees' becomes 'rs'.
'source of' suggests taking the first letters (the start - or source - of the word).
The initial letter of 'endless' is 'e'.
'remo'+'rs'+'e'='REMORSE'

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(Other definitions for remorse that I've seen before include "Sorrow for wrongs committed" , "display of conscience" , "A feeling of deep regret" , "Compunction" , "Pity" .)

I've seen this clue in The Daily Express.

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