The basics (4)
'the basics' is the definition.
('ABC's' can be a synonym of 'basics')
This is the entire clue.
(Other definitions for abcs that I've seen before include "Know these letters to be well informed" , "Know these to be well versed - alphabetically?" , "12 [THINGS EASY]" , "guides ..." .)
(Other definitions for bare bones that I've seen before include "Most basic facts or elements" , "Parliament?" , "Essentials" , "Essential components" , "The essence of" .)
(Another definition for barebones that I've seen is " Essential facts".)
'the basics' is the definition.
(synonyms)
This is the entire clue.