Defensive position mad character had about source of cash, indeed (3,4,6)
I believe the answer is:
for that matter
'indeed' is the definition.
(I've seen this before)
'defensive position mad character had about source of cash' is the wordplay.
I cannot really see how this works, but
'position' could be 'fort' (I have seen 'Strategic position ' mean 'fort' so perhaps 'position' could also mean 'fort') and 'fort' is present in the answer.
'character' could be 't' and 't' is present in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for for that matter that I've seen before include "as well" , "X-rated" , "Indeed" .)