Clue: Them old books? I study some­thing on the computer! (8)
Answer: EMOTICON
Explanation: Definition: some­thing on the computer!
A charade of EM ('them old'. Although now regarded as a colloquial abbreviation for 'them', in Old English it was a form in its own right) plus OT (Old Testament 'books') plus 'I' plus CON ('study').