Sam lies about having nothing to do (7)
I believe the answer is:
aimless
'nothing to do' is the definition.
I can't tell whether this definition defines the answer.
'sam lies about' is the wordplay.
'about' indicates anagramming the letters.
'sam'+'lies'='samlies'
'samlies' with letters rearranged gives 'AIMLESS'.
'having' acts as a link.
Can you help me to learn more?
(Other definitions for aimless that I've seen before include "Without direction or ambition" , "Like characters in 5D {WAITING FOR GODOT]" , "Lacking purpose" , "Haphazard" , "Without purpose or target" .)