Pole perhaps ultimately floats on bog (4)
I believe the answer is:
slav
'pole' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'ultimately floats on bog' is the wordplay.
'ultimately' indicates one should take the final letters.
'on' means one lot of letters go next to another.
'bog' becomes 'lav' (lavatory).
The last letter of 'floats' is 's'.
's'+'lav'='SLAV'
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for slav that I've seen before include "One coming from Eastern Europe or Asian Russia" , "European perhaps" , "A Russian, say" , "One of the European people" , "Person speaking one of related languages of Euro-Asian border" .)