Tea houses fashionable here? (5)
I believe the answer is:
china
'tea' is the definition.
(I've seen this before)
'houses fashionable here?' is the wordplay.
'houses' is an insertion indicator.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'here?' becomes 'cha' (I am not sure about this - if you are sure you should believe this answer much more).
'in' inserted into 'cha' is 'CHINA'.
Can you help me to learn more?
(Other definitions for china that I've seen before include "Ceramic material" , "Ceramics; country" , "country out east" , "Cathay was its archaic name" , "Make a chain in the country" .)