Some skincare for an old American (4)
I believe the answer is:
inca
'an old american' is the definition.
(the Inca were a South American people)
'some skincare for' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'INCA' can be found hidden inside 'skincare for'.
(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" .)