Observe a tool used by children

I believe the answer is:

seesaw

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'observe a tool used by children' is the definition.
I can't tell whether this definition defines the answer.

'observe a tool used by' is the wordplay.
'observe' becomes 'see' (I've seen this before).
'a tool' becomes 'saw' (saw is a kind of tool).
'used by' means one lot of letters go next to another.
'see'+'saw'='SEESAW'

Can you help me to learn more?

(Other definitions for seesaw that I've seen before include "Plaything that's ridden up and down" , "having to move from one extreme to the other" , "Move back and forth" , "Playground equipment for kids" , "Oscillate" .)

I've seen this clue in The Irish Independent.

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