Extra floor announced to hold new sets for musical (4,4,5)
I believe the answer is:
west side story
'musical' is the definition.
(I've seen this before)
'extra floor announced to hold new sets' is the wordplay.
I cannot quite see how this works, but
'extra' could be 'w' (abbreviation for 'wide' - cricket) and 'w' is present in the answer.
'floor' could be 'story' (synonyms) and 'story' is located in the answer.
an anagram of 'sets' is 'ests' which is present in the answer.
The remaining letters 'ide' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'for' acts as a link.
(Other definitions for west side story that I've seen before include "New-York-gangs musical" , "Romeo and Juliet adaptation" , "Jets/Sharks musical" , "1957 musical set in New York City" , "Bernstein/Sondheim musical" .)