Gosh! Small supernatural creature in person (6)
I believe the answer is:
myself
'person' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'gosh small supernatural creature' is the wordplay.
'gosh' becomes 'my' (both are old-fashioned expressions of surprise).
'small' becomes 's' (abbreviation - e.g. clothes size).
'supernatural creature' becomes 'elf' (I've seen this before).
'my'+'s'+'elf'='MYSELF'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for myself that I've seen before include "Reflexive pronoun" , "Me, in person" , "Crossword compiler" , "Emphatically, me" , "I personally" .)