The French figure the Spanish to be flush (5)
I believe the answer is:
level
'be flush' is the definition.
(I've seen this before)
'the french figure the spanish' is the wordplay.
'the french figure' becomes 'lev' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'the spanish' becomes 'el' ('the' in Spanish).
'lev'+'el'='LEVEL'
'to' is the link.
Can you help me to learn more?
(Other definitions for level that I've seen before include "Palindromic storey" , "Device ot establish a flat surface" , "Come clean" , "Uniform" , "Floor; horizontal" .)