Condition of contract for a school period (4)
I believe the answer is:
term
I believe this is a double definition.
'condition of contract' is the first definition.
(I've seen this before)
'a school period' is the second definition.
(I've seen this before)
'for' is the link.
(Other definitions for term that I've seen before include "A period, esp. of schooling" , "Word or expression for some particular thing" , "Expression, or school period" , "Time spent at school" , "Word; school session" .)