Cold, faultless advice from a rotter (3)
I believe the answer is:
cad
'a rotter' is the definition.
(a cad is a dishonourable person)
'cold faultless advice' is the wordplay.
'cold' becomes 'C' (eg on taps).
'faultless advice' becomes 'ad' (I can't explain this - if you can you should give a lot more credence to this answer).
'c'+'ad'='CAD'
'from' is the link.
Can you help me to learn more?
(Other definitions for cad that I've seen before include "designing software" , "A rotter, by Jove" , "Rotter, bounder" , "An Englishman who behaves dishonourably, a rotter" , "Rogue" .)