Profanities as naughty child draws across middle of frieze (9)

'profanities' is the definition.
(impious can mean profane or blasphemous)

'naughty child draws across middle of frieze' is the wordplay.
'naughty child' becomes 'imp' (informal term for a misbehaving child).
'draws' becomes 'ties' ('tie' can be a synonym of 'draw').
'across' indicates putting letters inside.
'middle of' says to take the centre.
The middle letters of 'frieze' are 'ie'.
'imp'+'ties'='impties'
'impties' going around 'ie' is 'IMPIETIES'.

'as' is the link.