Be perplexed about right relation (7)
I believe the answer is:
brother
'relation' is the definition.
(I know that brother subproperty of relation)
'be perplexed about right' is the wordplay.
I cannot quite see how this works, but
'right' could be 'r' (common abbreviation) and 'r' is located in the answer.
The remaining letters 'bother' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for brother that I've seen before include "Union member - male relative" , "Fellow-member" , "Male sibling" , "Trade unionist" , "Eg, monk, friar" .)