Relative position, say, about subject (5)
I believe the answer is:
liege
'subject' is the definition.
(thesaurus)
'relative position say about' is the wordplay.
'relative position' becomes 'lie' (lie is a kind of position. I am not sure about the 'relative' bit.**).
'say' becomes 'eg'.
'about' says the letters should be written backwards.
'eg' reversed gives 'ge'.
'lie'+'ge'='LIEGE'
Can you help me to learn more?
(Other definitions for liege that I've seen before include "Owing feudal allegiance" , "Feudal vassal from a Belgian city" , "Feudal (lord); vassal" , "Belgian city or ancient lord" , "Province of Belgium" .)