It shows how much we can put up with (9,4)
I believe the answer is:
endurance test
'with' is the definition.
The definition and answer are not the same part of speech.
'it shows how much we can put up' is the wordplay.
I cannot really see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
an anagram of 'can' is 'anc' which is located in the answer.
'put up' could be 'endure' (I've seen this before) and 'endure' is located in the remaining letters.
The remaining letters 'est' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for endurance test that I've seen before include "Trial of stamina" , "Trial of ability to undergo hardship" .)