Designed to be fashionable and well maintained (8)
I believe the answer is:
intended
'designed' is the definition.
(thesaurus)
'fashionable and well maintained' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'and' is a charade indicator (letters next to each other).
'well maintained' becomes 'tended' (tend can mean to maintain or look after. I am not sure about the 'well' bit.).
'in'+'tended'='INTENDED'
'to be' acts as a link.
Can you help me to learn more?
(Other definitions for intended that I've seen before include "Planned, meant to" , "One about to join union" , "Meant - fiancee" , "Had in mind to" , "wanted from the outset" .)