Sabbath want to get fashionable (5)
I believe the answer is:
swish
'fashionable' is the definition.
(thesaurus)
'sabbath want' is the wordplay.
'sabbath' becomes 's'.
'want' becomes 'wish' (wishing is a kind of wanting).
's'+'wish'='SWISH'
'to get' is the link.
(Other definitions for swish that I've seen before include "Stylish (sl.)" , "Sound of cane" , "Extravagant" , "Impressively fashionable" , "Smart, fashionable" .)