Sam lies about having nothing to do (7)

I believe the answer is:

aimless

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Independent.

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