Hiding, hide slingshot (9)

I believe the answer is:

shielding

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'hiding' is the definition.
(shielding is a kind of hiding)

'hide slingshot' is the wordplay.
'hide' becomes 'shield' (shielding is a kind of hiding).
'slingshot' becomes 'ing' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'shield'+'ing'='SHIELDING'

Can you help me to learn more?

(Another definition for shielding that I've seen is " Protecting".)

I've seen this clue in The Daily Express.

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