Upset about current times, knocked back drink, that might help (6)
I believe the answer is:
elixir
'drink that might help' is the definition.
'elixir' can be an answer for 'drink' (elixir is a kind of drink). I'm not sure about the rest of the definition.
'upset about current times knocked back' is the wordplay.
'upset' becomes 'rile' (to rile is to annoy or upset).
'about' means one lot of letters goes inside another.
'current' becomes 'I' (symbol for electric current).
'times' becomes 'x' (x resembles the multiplication or times sign).
'knocked back' is a reversal indicator.
'i'+'x'='ix'
'rile' placed around 'ix' is 'rixile'.
'rixile' reversed gives 'ELIXIR'.
Can you help me to learn more?
(Other definitions for elixir that I've seen before include "quack remedy" , "Magic cure-all" , "Magical or medicinal potion" , "Cure-all potion" , "The old alchemists sought this of life" .)