Stopped wanting Arab to be relaxed (6)
I believe the answer is:
rested
'be relaxed' is the definition.
(I've seen this in another clue)
'stopped wanting arab' is the wordplay.
'stopped' becomes 'arrested' (arrest can mean to stop or obstruct).
'wanting' suggests deleting specific letters (to want something can mean to lack it or need it).
'arab' becomes 'Ar.' (abbreviation in Chambers).
'arrested' with 'ar' taken out is 'RESTED'.
'to' is the link.
(Other definitions for rested that I've seen before include "Took break in desert" , "Took one's ease" , "Took a break from activities" , "Relaxed, took a break" , "Reposed or took a breather" .)