Against (6)
(Other definitions for beside that I've seen before include "- - the point" , "Very near to" , "Next door to" , "Adjacent to" , "Next to - compared with" .)
'against' is the definition.
(as in one sports team versus another)
This is the entire clue.
(Other definitions for versus that I've seen before include "playing" , "Against in games" , "taking part in team sports" , "Set against" , "In opposition to" .)
'against' is the definition.
(prefix meaning against)
This is the entire clue.
(Other definitions for anti that I've seen before include "one opposing?" , "Against, informally" , "Prefix meaning against" , "Naysayer" , "Opposed to followers of Hitler" .)
'against' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for into that I've seen before include "To a position inside" , "Keenly interested in" , "Keen on (informal)" , "Curious about" , "ignition regularly missing" .)
'against' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for opposed that I've seen before include "Adverse, antipathetic" , "Confronted" , "Objected to" , "likely to refuse?" , "Withstood" .)