Plans a school wrestling team adopts (8)
I believe the answer is:
schemata
'plans' is the definition.
(schema is a kind of plan)
'a school wrestling team adopts' is the wordplay.
'school' becomes 'sch' (common abbreviation).
'wrestling' indicates an anagram.
'adopts' is an insertion indicator.
'team' is an anagram of '[team]'.
'sch'+'[team]'='sch[team]'
'a' inserted into 'schemta' is 'SCHEMATA'.
(Other definitions for schemata that I've seen before include "diagrams" , "Diagrammatic outlines" , "Plans" .)