Mistakes burn LEDs explosively (8)
I believe the answer is:
blunders
'mistakes' is the definition.
(I know this)
'burn leds explosively' is the wordplay.
'explosively' is an anagram indicator.
'burn'+'leds'='burnleds'
'burnleds' is an anagram of 'BLUNDERS'.
(Other definitions for blunders that I've seen before include "Clumsy mistakes or gaffes" , "Embarrassing mistakes" , "Mistakes made through ignorance or carelessness" .)