Regularly target a certain prize (8)

I believe the answer is:

treasure

'prize' is the definition.
(I know that prize can be written as treasure)

'regularly target a certain' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'certain' becomes 'sure' (synonyms).
The alternate letters of 'target' are 'tre'.
'tre'+'a'+'sure'='TREASURE'

(Other definitions for treasure that I've seen before include "Quantity of precious objects" , "X marks its spot!" , "Value highly" , "Valuable hoard" , "Very valuable object" .)

I've seen this clue in The Independent and The Sun.

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