To take a course like this is humiliating (3,6,3)
I believe the answer is:
eat humble pie
'a course like this is humiliating' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'to take' is the wordplay.
I cannot really see how this works, but
'take' could be 'eat' (eating is a kind of taking) and 'eat' is present in the answer.
The remaining letters 'humblepie' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for eat humble pie that I've seen before include "Be forced to apologise" , "Make an abject apology" , "Admit one's mistakes" , "Abase oneself" , "Act meekly and apologetically" .)