’e led Wise's production of a song (9)
I believe the answer is:
edelweiss
'a song' is the definition.
(song from The Sound of Music)
''e led wise's production' is the wordplay.
'production' indicates anagramming the letters.
'led'+'wises'='ledwises'
'ledwises' anagrammed gives 'delweiss'.
'e'+'delweiss'='EDELWEISS'
'of' is the link.
(Other definitions for edelweiss that I've seen before include "Swedes lie about small white flower in Switzerland" , "Perennial Alpine plant -- we see lids (anag)" , "I weed less when this flower is around" , "White-flowered alpine plant" , "Ewe slides on the alpine plant" .)