Crossword Genius

Regarding saint wearing a halo (2,2)

Ross

I believe the answer is:

as to

'regarding' is the definition.
(thesaurus)

'saint wearing a halo' is the wordplay.
'saint' becomes 'st'.
'wearing' is an insertion indicator.
'halo' becomes 'o' (O resembles a halo).
'a'+'o'='ao'
'st' inserted inside 'ao' is 'AS TO'.

(Another definition for as to that I've seen is " Concerning".)

I've seen this clue in The Telegraph.
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