Type of school providing Greek in the morning, followed by introductory mathematics and religion (7)
I believe the answer is:
grammar
'type of school' is the definition.
(I've seen this before)
'greek in the morning followed by introductory mathematics and religion' is the wordplay.
'greek' becomes 'gr'.
'in the morning' becomes 'am'.
'followed by' is a charade indicator (letters next to each other).
'introductory' says to take the initial letters.
The initial letters of 'mathematics and religion' is 'mar'.
'gr'+'am'+'mar'='GRAMMAR'
'providing' is the link.
(Other definitions for grammar that I've seen before include "Correct word use" , "Basic rules of language" , "Syntax etc" , "Study of words and sentences" , "A language's syntax and morphology" .)