This provides cover until para breaks out (9)
I believe the answer is:
tarpaulin
'this provides cover' is the definition.
The definition suggests a singular noun which matches the answer.
'until para breaks out' is the wordplay.
'breaks out' is an anagram indicator.
'until'+'para'='untilpara'
'untilpara' with letters rearranged gives 'TARPAULIN'.
Can you help me to learn more?
(Other definitions for tarpaulin that I've seen before include "It provides protection" , "oilskin hat" , "[SHHET]" , "seaman rarely required" , "protective headgear" .)