Fish below, little Florence above (8)
I believe the answer is:
flounder
'fish' is the definition.
(I know that flounder is a type of fish)
'below little florence above' is the wordplay.
'below' becomes 'under' (synonyms).
'little florence' becomes 'flo' (I am not sure about the 'little' bit.).
'above' is a charade indicator (letters next to each other) (in a down clue, some letters go above others).
'under' put after 'flo' is 'FLOUNDER'.
Can you help me to learn more?
(Other definitions for flounder that I've seen before include "small swimmer" , "Be out of one's depth" , "Thrash about helplessly around the fish" , "fumble?" , "Grope around" .)