To Henry, nothing looks saintly! (4)

I believe the answer is:

halo

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

'looks saintly' is the definition.
I can't tell whether this defines the answer.

'to henry nothing' is the wordplay.
'to henry' becomes 'hal'.
'nothing' becomes 'o' (looks like zero - 0).
'hal'+'o'='HALO'

Can you help me to learn more?

(Other definitions for halo that I've seen before include "Angelic aura" , "Band of light" , "Nimbus" , "Disc of light" , "Ring (around sun or moon)" .)

I've seen this clue in the Evening Standard.

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