Crossword Genius

Handy round protective device (2,3)

Ross

I believe the answer is:

of use

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

'handy' is the definition.
(I've seen this before)

'round protective device' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'protective device' becomes 'fuse' (fuse is a kind of device. I am not sure about the 'protective' bit.).
'o'+'fuse'='OF USE'

Can you help me to learn more?

(Other definitions for of use that I've seen before include "Having a function" , "Serviceable" , "Useful" , "Nifty" , "Handy" .)

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