Lied in a way that's simply useless (4)

I believe the answer is:

idle

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'simply useless' is the definition.
'idle' can be an answer for 'useless' (I've seen this before). I am not certain of the 'simply' bit.

'lied in a way' is the wordplay.
'in a way' is an anagram indicator.
'lied' is an anagram of 'IDLE'.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for idle that I've seen before include "Unoccupied (time); run (engine) slowly" , "Not busy" , "Lazy - unemployed" , "Still" , "Loaf" .)

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