Equipment used in play watched by spy (6)
I believe the answer is:
seesaw
'equipment used in play' is the definition.
I can't judge whether this definition defines the answer.
'watched by spy' is the wordplay.
'watched' becomes 'saw' ('see' can be a synonym of 'watch').
'by' is a charade indicator (letters next to each other).
'spy' becomes 'see' (spy can mean to watch or see).
'saw' after 'see' is 'SEESAW'.
Can you help me to learn more?
(Other definitions for seesaw that I've seen before include "Pivoted amusement" , "Recreation ground item" , "Playground rocker" , "Plaything with up-and-down movement" , "Children's plaything with plank over barrel" .)