In Cup red player, yard away, smashed upright (13)
I believe the answer is:
perpendicular
'upright' is the definition.
(synonyms)
'in cup red player yard away smashed' is the wordplay.
'yard' becomes 'y' (abbreviation).
'away' suggests deleting specific letters.
'smashed' indicates an anagram.
'in'+'cup'+'red'+'player'='incupredplayer'
'incupredplayer' with 'y' taken away is 'incupredplaer'.
'incupredplaer' anagrammed gives 'PERPENDICULAR'.
(Other definitions for perpendicular that I've seen before include "Gothic style following 7" , "At right angles" , "Style of late English Gothic church architecture" , "Like this answer [1A], relative to 1 dn" , "Sort of architecture" .)