Fight with me and Robert E. (5)
I believe the answer is:
melee
'fight' is the definition.
(I've seen this in another clue)
'with me and robert e' is the wordplay.
'with' says to put letters next to each other.
'and' means one lot of letters go next to another.
'robert' becomes 'le' (I can't justify this - if you can you should believe this answer much more).
'me'+'le'='mele'
'mele'+'e' is 'MELEE'.
Can you help me to learn more?
(Other definitions for melee that I've seen before include "Confused conflict, affray" , "Noisy riotous fight" , "Confused brawl" , "A confused free-for-all" , "confused group" .)