Doctor may bless the school gathering (8)
I believe the answer is:
assembly
'the school gathering' is the definition.
(I've seen this before)
'doctor may bless' is the wordplay.
'doctor' indicates anagramming the letters.
'may'+'bless'='maybless'
'maybless' anagrammed gives 'ASSEMBLY'.
(Other definitions for assembly that I've seen before include "Gathering, congregation" , "School morning gathering" , "A gathering for formal meeting" , "Gathering for a special purpose" , "court" .)