A tantaliser resting (2,4)

I believe the answer is:

at ease

I'm a little stuck... Click here to teach me more about this clue!

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

'a tantaliser' is the wordplay.
'tantaliser' becomes 'tease' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'tease'='AT EASE'

Can you help me to learn more?

(Other definitions for at ease that I've seen before include "with no worries" , "Calm" , "resting" , "'Relaxed (2,4)'" , "Free from discomfort - that's an order" .)

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