Strangely, this describes low energy drink (8)
I believe the answer is:
smoothie
'drink' is the definition.
(I've seen this before)
'strangely this describes low energy' is the wordplay.
'strangely' indicates anagramming the letters.
'describes' is an insertion indicator (describe can mean to form the outline of).
'low' becomes 'moo' ('moo' can be a synonym of 'low').
'energy' becomes 'e' (physics symbol as in E=mc2).
'this' is an anagram of 'sthi'.
'sthi' enclosing 'moo' is 'smoothi'.
'smoothi'+'e'='SMOOTHIE'
(Other definitions for smoothie that I've seen before include "Plausible person" , "Drink made with pureed fruit" , "Drink of pureed fresh fruit with yoghurt or milk" , "cold and thick" , "Thick, drink of pureed fruit" .)