Like fireworks going off in porch etc, around end of day (11)
I believe the answer is:
pyrotechnic
'like fireworks' is the definition.
(fireworks are a type of pyrotechnic)
'going off in porch etc around end of day' is the wordplay.
'going off' indicates anagramming the letters.
'around end of' suggests the final letters.
The final letter of 'day' is 'y'.
'in'+'porch'+'etc'+'y'='inporchetcy'
'inporchetcy' with letters rearranged gives 'PYROTECHNIC'.
(Other definitions for pyrotechnic that I've seen before include "Brilliant" , "Of bangers and rockets" , "Relating to fireworks" .)