Endure criticism doing a thing (5-2-2)
I believe the answer is:
stick-at-it
'endure' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'criticism doing a thing' is the wordplay.
I cannot quite see how this works, but
'criticism' could be 'stick' (giving someone stick is criticising them) and 'stick' is located in the answer.
'a' is present in the answer.
'thing' could be 'it' and 'it' is found within the answer.
A single letter 't' remains 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?
(Another definition for stick-at-it that I've seen is " Keep on trying - adhere to task".)