Attach and use force evenly on top figure (7)
I believe the answer is:
octagon
'top figure' is the definition.
'octagon' can be an answer for 'figure' (octagon is a kind of figure). I am not certain of the 'top' bit.
'attach and use force evenly on' is the wordplay.
'attach' becomes 'tag' (tagging is a kind of attaching).
'and' means one lot of letters go next to another (I've seen this in other clues).
'use force evenly' becomes 'oc' (I am not sure about this - if you are sure you should believe this answer much more).
'tag' after 'oc' is 'octag'.
'octag'+'on'='OCTAGON'
Can you help me to learn more?
(Other definitions for octagon that I've seen before include "Shape of a square with the corners cut off" , "with eight angles" , "Figure of many sides" , "Eight sided figure" , "Eight-sided object" .)