Unaffected by regular current variations (8)

I believe the answer is:

tideless

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'unaffected by regular' is the definition.
The definition suggests an adjective which matches the answer.

'current variations' is the wordplay.
'current' becomes 'tide' (sea currents).
'variations' becomes 'less' (I can't explain this - if you can you should give a lot more credence to this answer).
'tide'+'less'='TIDELESS'

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I've seen this clue in The Irish Independent.

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