Crossword Genius

Mistake in opening of ten excellent houses (7)

Ross

I believe the answer is:

terrace

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

'mistake in opening of ten excellent houses' is the definition.
'terrace' can be an answer for 'houses' (I've seen this before). I am unsure of the 'mistake in opening of ten excellent' bit.

'mistake in opening of ten excellent houses' is the wordplay.
'mistake in' becomes 'err' ('err' can be a synonym of 'mistake'. I am not sure about the 'in' bit.**).
'opening of' indicates taking the first letters.
'excellent' becomes 'ace' (I've seen this before).
'houses' is an insertion indicator.
The first letter of 'ten' is 't'.
't'+'ace'='tace'
'err' inserted into 'tace' is 'TERRACE'.

Can you help me to learn more?

(Other definitions for terrace that I've seen before include "Stadium's standing area" , "Continuous row of houses" , "Row of attached houses" , "Urban housing" , "stand" .)

I've seen this clue in The Independent.
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