Same level within carpark (3)

I believe the answer is:

par

'same level' is the definition.
(par is an average or standard level)

'within carpark' is the wordplay.
'within' indicates a hidden word.
'PAR' is hidden within 'carpark'.

(Other definitions for par that I've seen before include "normal amount" , "Average or normal score" , "Average score for round of golf" , "Normal level or standard" , "A number of golfing" .)

I've seen this clue in The Mirror.

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