Fail to honour the commitments of one's class? (4,6)
I believe the answer is:
play truant
'fail' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'honour the commitments of one's class?' is the wordplay.
I cannot really understand how this works, but
'honour' could be 'an' (AN is an example) and 'an' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'one' could be 'a' (a thing is one thing) and 'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for play truant that I've seen before include "Stay away from school" , "Miss school" , "Avoid school" , "Go AWOL from school" , "Skip school" .)