About four, I, in France, dance (4)
I believe the answer is:
jive
'dance' is the definition.
(jiving is a kind of dancing)
'about four i in france' is the wordplay.
'about' is an insertion indicator.
'four' becomes 'iv' ('IV' can be a synonym of 'four').
'i in france' becomes 'je' (I can't explain this - if you can you should give a lot more credence to this answer).
'iv' inserted within 'je' is 'JIVE'.
Can you help me to learn more?
(Other definitions for jive that I've seen before include "1930s' big band jazz style" , "Style of fast dance music" , "Fast dancing style" , "Jazzy dance" , "Jerky dance of the 1940s and 1950s" .)