Relax - everything else is simple (4,4)

I believe the answer is:

rest easy

'relax' is the definition.
(I've seen this in another clue)

'everything else is simple' is the wordplay.
'everything else' becomes 'rest' (I've seen this in another clue).
'is simple' becomes 'easy' (similar in meaning).
'rest'+'easy'='REST EASY'

I've seen this clue in The Irish Times.

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