Stage production of Aida short of an alto and soprano (4)
I believe the answer is:
dais
'stage' is the definition.
(type of platform or stage)
'production of aida short of an alto and soprano' is the wordplay.
'production of' indicates anagramming the letters.
'short of' indicates named letters should be taken away.
'an alto' becomes 'a' (musical abbreviation).
'and' means one lot of letters go next to another.
'soprano' becomes 's' (musical abbreviation).
'aida' with 'a' removed is 'ida'.
'ida' with letters rearranged gives 'dai'.
'dai'+'s'='DAIS'
(Other definitions for dais that I've seen before include "Low platform at end of hall" , "stepping up here?" , "stand" , "Raised floor" , "Platform; podium" .)