Fail spectacularly with English dessert (5)
I believe the answer is:
bombe
'dessert' is the definition.
(I've seen this before)
'fail spectacularly with english' is the wordplay.
'fail spectacularly' becomes 'bomb' (I've seen this in another clue).
'with' means one lot of letters go next to another.
'english' becomes 'e' (abbreviation).
'bomb'+'e'='BOMBE'
(Other definitions for bombe that I've seen before include "Ice-cream dessert" , "Ice cream frozen in a round mould" , "like some rounded furniture" , "Dome-shaped dessert, often frozen" , "Sweet" .)