Ice-cream article in house (7)
I believe the answer is:
vanilla
'ice-cream' is the definition.
I can't tell whether this definition defines the answer.
'article in house' is the wordplay.
'article' becomes 'an' (indefinite article).
'in' means one lot of letters goes inside another.
'house' becomes 'villa' (villa is a kind of house).
'an' inserted within 'villa' is 'VANILLA'.
Can you help me to learn more?
(Other definitions for vanilla that I've seen before include "Commonplace - flavouring" , "Seed pod used to flavour food" , "ice cream, perhaps" , "Without any extras - all vain (anag)" , "without additions" .)