Gloss over disappearing grove - it's a tax right-off (4)
I believe the answer is:
Here is my best explanation:
'a tax right-off' is the definition.
I can't tell whether this definition defines the answer.
'gloss over disappearing grove' is the subsidiary indication.
'loss' is hidden in amongst the letters.
However, I am uncertain how the hidden word is indicated.
'it's' is the link.
(Other definitions for loss that I've seen before include "Deficit", "Forfeiture", "Financial reverse", "Bereavement", "Destruction", "Failure to profit or succeed", "A defeat (in sports)", "A defeat in sport", "Defeat (in sport)" and "Cost".)