Just the thing for honey-producers to kneel on! (3,4,5)
I believe the answer is:
the bees knees
'kneel on' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'just the thing for honey-producers' is the wordplay.
I cannot really see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'honey producers' could be 'bees' (I've seen this before) and 'bees' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for the bees knees that I've seen before include "Excellent thing" , "Ideal person, event" , "joints used to crawl with insects?" , "Outstandingly good thing" , "Just the very best" .)