Right honourable thing to wear? (4)
I believe the answer is:
robe
'wear?' is the definition.
(robe is a kind of wear)
'right honourable thing' is the wordplay.
'right' becomes 'r' (common abbreviation).
'honourable thing' becomes 'obe' (I can't justify this - if you can you should believe this answer much more).
'r'+'obe'='ROBE'
'to' is the link.
Can you help me to learn more?
(Other definitions for robe that I've seen before include "Gown or dress of office" , "judge's garment" , "Loose or formal garment" , "Clerical garment" , "Loose outer garment" .)