Fluster-free? (7)

I believe the answer is:

restful

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'fluster-free?' is the definition.
I can't judge whether this definition defines the answer.

'fluster-free?' is the wordplay.
'free?' indicates anagramming the letters (I've seen 'freed' mean this).
'fluster' anagrammed gives 'RESTFUL'.

Can you help me to learn more?

(Other definitions for restful that I've seen before include "Quiet, soothing" , "Soothing is required" , "Calm" , "Relaxing" , "Still - calming" .)

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