Children’s spotting game (1-3)

I think it could be either:

Which length description are you looking for?:

1-3

i-spy

(Other definitions for i-spy that I've seen before include "Wordgame" , "Children's alphabet game" , "Child's game: ''. ... with my little eye'" , "Children's guessing game" , "Child's guessing game" .)

I've seen this clue in The Times.

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