Rest, seeing two score 1,000 in victories (5,5)
I believe the answer is:
forty winks
'rest' is the definition.
(thesaurus)
'two score 1000 in victories' is the wordplay.
'two score' becomes 'forty' (I've seen this before).
'1000' becomes 'k' ('K' can be a synonym of '1000').
'in' indicates putting letters inside.
'victories' becomes 'wins' (I've seen this before).
'k' going within 'wins' is 'winks'.
'forty'+'winks'='FORTY WINKS'
'seeing' acts as a link.
(Other definitions for forty winks that I've seen before include "Kip" , "Snooze" , "Quick nap" , "Rest" .)