Maker of Aspire PCs (4)
I believe the answer is:
acer
'maker of aspire pcs' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for acer that I've seen before include "ornamental tree" , "Tree with winged fruit" , "Tree or shrub of the maple genus" , "Plant" , "Tree of maple family" .)