A case of English idiot interrupting play? (8)
I believe the answer is:
genitive
'a case' is the definition.
(the genitive case in grammar)
'english idiot interrupting play?' is the wordplay.
'english' becomes 'E' (abbreviation).
'idiot' becomes 'nit' (nit can mean a stupid person).
'interrupting' means one lot of letters goes inside another.
'play?' becomes 'give' (both can mean flexibility).
'e'+'nit'='enit'
'enit' going into 'give' is 'GENITIVE'.
'of' is the link.
(Other definitions for genitive that I've seen before include "This case shows possession" , "(In grammar) the possessive case" .)