At peace, basking in purest fulfilment (7)

I believe the answer is:

restful

'at peace' is the definition.
(thesaurus)

'basking in purest fulfilment' is the wordplay.
'basking in' indicates the answer is hidden within the clue.
'RESTFUL' can be found hidden inside 'purest fulfilment'.

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

I've seen this clue in The Independent.

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