Tag geese wandering around river -- you won't find one laying this! (6,3)

I believe the answer is:

easter egg

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'you won't find one laying this' is the definition.
The definition suggests a singular noun which matches the answer.

'tag geese wandering around river' is the wordplay.
'wandering' indicates anagramming the letters.
'around' is an insertion indicator.
'river' becomes 'r'.
'tag'+'geese'='taggeese'
'taggeese' with letters rearranged gives 'easteegg'.
'easteegg' placed around 'r' is 'EASTER EGG'.

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(Other definitions for easter egg that I've seen before include "DVD bonus" , "Springtime confection" , "chocolate gift" , "Seasonal fare" , "Sweet for Spring festival" .)

I've seen this clue in The Telegraph.

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