Variety of tea grew fashionable (7)
I believe the answer is:
rosehip
'variety of tea' is the definition.
The definition suggests a singular noun which matches the answer.
'grew fashionable' is the wordplay.
'grew' becomes 'rose' (rise can mean to grow or increase).
'fashionable' becomes 'hip' (hip can mean trendy or fashionable).
'rose'+'hip'='ROSEHIP'
Can you help me to learn more?
(Other definitions for rosehip that I've seen before include "Fruit of the briar" , "Wayside fruit" , "Fruit on wild plant" , "Wild fruit for syrup" , "Part of plant" .)