Band from Stoke essentially unchanged (5)
I believe the answer is:
Here is my best explanation:
'band' is the definition.
(I have seen 'British band' mean 'oasis' so perhaps 'band' could also mean 'oasis')
'stoke essentially unchanged' is the subsidiary indication.
'essentially' says to take the centre.
'unchanged' becomes 'asis' (I've seen this before).
The middle letters of 'stoke' are 'o'.
'from' is the link.
(Other definitions for oasis that I've seen before include "Fertile part of desert", "Desert water-hole", "Place of peace", "quiet spot", "retreat", "can provide welcome relief", "place of calm", "Desert sanctuary", "Place of refreshment" and "Pop group".)