Crossword Genius

Religious houses bar one good -- astonishing! (10)

Ross

I believe the answer is:

prodigious

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

'religious houses bar one good' is the wordplay.
'religious' becomes 'pious' (associated in meaning).
'houses' is an insertion indicator.
'bar' becomes 'rod' (I've seen this before).
'one' becomes 'i' (roman numeral).
'good' becomes 'g' (abbreviation).
'rod'+'i'+'g'='rodig'
'pious' enclosing 'rodig' is 'PRODIGIOUS'.

(Another definition for prodigious that I've seen is " astonishing".)

I've seen this clue in The Telegraph.
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