Natural sunburn soother (4)
I believe the answer is:
aloe
'natural sunburn soother' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aloe that I've seen before include ". . . . vera, soothing plant" , "O, ale with bitter plant" , "Bitter drug from a leaf juice" , "Genus of bitter herbs" , "Bitter fruit" .)