Crossword Genius

One look may be child's-play (1-3)

Ross

I believe the answer is:

i-spy

I'm a little stuck... Click here to teach me more about this clue!

'be child's-play' is the definition.
I can't tell whether this defines the answer.

'one look' is the wordplay.
'one' becomes 'I' (Roman numeral).
'look' becomes 'spy'.
'i'+'spy'='I-SPY'

'may' acts as a link.

Can you help me to learn more?

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

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