I text in support of reduced school breaks (7)
I believe the answer is:
schisms
'breaks' is the definition.
(I know this)
'i text in support of reduced school' is the wordplay.
'text' becomes 'SMS' (abbreviation for Short Message Service).
'in support of' says to put letters next to each other (in a down clue, some letters hold others up).
'reduced school' becomes 'sch' (abbreviation; 'reduced' suggests an abbreviation).
'i'+'sms'='isms'
'isms' put after 'sch' is 'SCHISMS'.
(Other definitions for schisms that I've seen before include "Breaches in churches" , "Religious disunities" , "Breaches in the church" .)