Certainly not obtained without resources (2,2,5)
I believe the answer is:
by no means
'certainly not' is the definition.
(by no means means not at all or certainly not)
'obtained without resources' is the wordplay.
I cannot really see how this works, but
'without' could be 'no' and 'no' is located in the answer.
'resources' could be 'means' (means can mean financial resources) and 'means' is present in the answer.
The remaining letters 'by' 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?
(Other definitions for by no means that I've seen before include "Certainly not, not in any way" , "Definitely not" , "Without using any method" , "Forbids" , "Certainly not, perish the thought" .)