Good and bad days a lift operator knows all about (3,3,5)
I believe the answer is:
ups and downs
'a lift operator knows all about' is the definition.
I can't judge whether this definition defines the answer.
'good and bad days' is the wordplay.
I cannot quite see how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'bad' could be 'sad' (similar in meaning) and 'sad' is found in the leftover letters.
'days' could be 'd' and 'd' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for ups and downs that I've seen before include "Successes and failures" , "Vicissitudes" , "variations?" .)