Hear idea holds no water (4)

I believe the answer is:

arid

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'hear idea holds no water' is the definition.
I can't tell whether this definition defines the answer.

'hear idea holds' is the wordplay.
'holds' says the answer is hidden in the clue.
'ARID' can be found hidden inside 'hear idea'.

Can you help me to learn more?

(Other definitions for arid that I've seen before include "Without water" , "Dry raid" , "Wadi may be this" , "Dry and withered" , "Dry and parched, as with regions" .)

I've seen this clue in The Mirror.

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