So, is a storm a welcome sight in a desert? (5)
I believe the answer is:
oasis
'a welcome sight in a desert?' is the definition.
(I've seen this in another clue)
'so is a storm' is the wordplay.
'storm' indicates anagramming the letters.
'so'+'is'+'a'='soisa'
'soisa' anagrammed gives 'OASIS'.
(Other definitions for oasis that I've seen before include "Fertile place like waterhole in desert" , "Fertile place in a desert, watering-hole" , "Peaceful area away from trouble" , "Q-and-A game" , "Fertile area in desert" .)