Streetlight failed without current and power (8)
I believe the answer is:
lamppost
'streetlight' is the definition.
(I know that streetlight can be written as lamppost)
'failed without current and power' is the wordplay.
'failed' becomes 'lost' (I can't explain this - if you can you should give a lot more credence to this answer).
'without' means one lot of letters goes inside another ('without' can be similar in meaning to 'outside').
'current' becomes 'amp' (electricity).
'and' says to put letters next to each other.
'power' becomes 'p' (symbol in physics).
'amp'+'p'='ampp'
'lost' placed around 'ampp' is 'LAMPPOST'.
Can you help me to learn more?
(Other definitions for lamppost that I've seen before include "Enlightenment can be obtained from this" , "Street furniture on which George Formby would lean in song" , "Support for public illumination" , "Street light (on which George Formby leant?)" , "Pillar for street light" .)