Bends the knee for information on fuel mixture certificates (10)

'bends the knee' is the definition.
The definition and answer can be both to do with motion as well as being verbs in their -s form.
Perhaps you can see a link between them that I don't see?

'information on fuel mixture certificates' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'on' means one lot of letters go next to another.
'mixture' indicates anagramming the letters.
'certificates' becomes 'cts' (I can't justify this - if you can you should give a lot more credence to this answer).
'fuel' with letters rearranged gives 'ufle'.
'gen'+'ufle'+'cts'='GENUFLECTS'

'for' acts as a link.

Can you help me to learn more?