Bands take LSD with energy in empty stadiums (7)
I believe the answer is:
stripes
'bands' is the definition.
('stripe' can be a synonym of 'band')
'lsd with energy in empty stadiums' is the wordplay.
'lsd with' becomes 'trip' (I can't explain this - if you can you should believe this answer much more).
'energy' becomes 'e' (physics symbol as in E=mcr).
'in' means one lot of letters goes inside another.
'empty' means to remove the middle letters.
'stadiums' with its middle removed is 'ss'.
'trip'+'e'='tripe'
'tripe' placed into 'ss' is 'STRIPES'.
'take' acts as a link.
Can you help me to learn more?
(Other definitions for stripes that I've seen before include "As standard feature" , "Persist (anag)" , "They are given to corporal" , "punishment" , "Bands or lines" .)