Eat humble pie as pie logo crumbled (9)
I believe the answer is:
apologise
'eat humble pie' is the definition.
I can't judge whether this defines the answer.
'as pie logo crumbled' is the wordplay.
'crumbled' indicates an anagram.
'as'+'pie'+'logo'='aspielogo'
'aspielogo' anagrammed gives 'APOLOGISE'.
Can you help me to learn more?
(Other definitions for apologise that I've seen before include "Say one is sorry" , "Say sorry, my mistake" , "Ask forgiveness" , "Say sorry, my fault" , "Express regret for a wrong (S, not Z)" .)