Blunder with English? Nonsense (5)
I believe the answer is:
tripe
'nonsense' is the definition.
(thesaurus)
'blunder with english?' is the wordplay.
'blunder' becomes 'trip' (trip is a kind of blunder).
'with english?' becomes 'e' (abbreviation. I am not sure about the 'with' bit.**).
'trip'+'e'='TRIPE'
Can you help me to learn more?
(Other definitions for tripe that I've seen before include "Rubbish; stomach as food" , "Swallowed" , "Garbage" , "Edible entrails" , "Rubbish (colloq.)" .)