Fairy that comes from the Spanish folksong originally (3)
I believe the answer is:
elf
'fairy' is the definition.
(I know that elf is a type of fairy)
'the spanish folksong originally' is the wordplay.
'the spanish' becomes 'el' ('the' in Spanish).
'originally' suggests taking the first letters.
The first letter of 'folksong' is 'f'.
'el'+'f'='ELF'
'that comes from' is the link.
(Other definitions for elf that I've seen before include "Malignant fairy" , "Goblin" , "Robin Goodfellow?" , "spirit" , "1 ac fairy" .)