Greasing the wheels after seat finally is occupied by Labour? (7)
I believe the answer is:
toiling
'greasing the wheels after seat finally' is the definition.
I can't tell whether this defines the answer.
'occupied by labour?' is the wordplay.
'occupied' becomes 'ing' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'by' means one lot of letters go next to another.
'labour?' becomes 'toil' ('toil' can be a synonym of 'labour').
'ing' put after 'toil' is 'TOILING'.
'is' acts as a link.
Can you help me to learn more?
(Another definition for toiling that I've seen is " Working long and hard".)