Crossword Genius

Financially sound PC spoke resoundingly about that heartlessly (6-8)

Ross

I believe the answer is:

copper-bottomed

I'm a little stuck... Click here to teach me more about this clue!

'financially sound' is the definition.
'copper-bottomed' can be an answer for 'sound' (both can mean reliable). I am not certain of the 'financially' bit.

'pc spoke resoundingly about that heartlessly' is the wordplay.
I cannot really see how this works, but
'pc' could be 'copper' (I've seen this before) and 'copper' is found within the answer.
The remaining letters 'bottomed' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Times.
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