Some skincare for an old American (4)
I believe the answer is:
inca
'old american' is the definition.
(the Inca were a South American people)
'some skincare for' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'INCA' can be found hidden inside 'skincare for'.
'an' acts as a link.
(Other definitions for inca that I've seen before include "Pre-conquest Andean" , "Ancient Peruvian like Cain" , "Old Peruvian people" , "S. Am native, lord in Quechua" , "Native Peruvian" .)