Inconclusive result, game being one that goes up and down (10)
I believe the answer is:
drawbridge
'being one that goes up and down' is the definition.
(a drawbridge may be pulled up)
'inconclusive result game' is the wordplay.
'inconclusive result' becomes 'draw' (sporting result with no winner).
'game' becomes 'bridge' (card game).
'draw'+'bridge'='DRAWBRIDGE'
(Other definitions for drawbridge that I've seen before include "Removable access to castle" , "It spans a moat" , "One may protect castle" , "for reasons of security" , "that's raised by defenders" .)