Lover is worn out with minimal energy (6)
I believe the answer is:
isolde
'lover' is the definition.
(I've seen this before)
'is worn out with minimal energy' is the wordplay.
'worn out' becomes 'old'.
'with' is a charade indicator (letters next to each other).
'minimal' says to take the initial letters.
The first letter of 'energy' is 'e'.
'is'+'old'+'e'='ISOLDE'
(Other definitions for isolde that I've seen before include "Tristan and . . . . . . (Wager opera)" , "Tristan's mate" , "love potion drinker" , "Operatic heroine" , "heroine (sic)" .)