Minor misdeed according to Catholics in an Elvis medley (6,3)

I believe the answer is:

venial sin

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

'minor misdeed' is the definition.
'venial sin' can be an answer for 'misdeed' (thesaurus). I'm not certain of the 'minor' bit.

'catholics in an elvis medley' is the wordplay.
'in an elvis' can be anagrammed to 'VENIAL SIN'.
Though, I'm not sure how this is indicated.

'according to' acts as a link.

Can you help me to learn more?

(Other definitions for venial sin that I've seen before include "Pardonable spiritual offence - not mortal" , "wrong, but forgivable" , "Minor offence against morality" .)

I've seen this clue in the Sydney Morning Herald.

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