In ordinary language, right in position (5)
I believe the answer is:
prose
'in ordinary language' is the definition.
'prose' can be an answer for 'language' (I have seen 'Ordinary language ' mean 'prose' so perhaps 'language' could also mean 'prose'). I'm not certain of the 'in ordinary' bit.
'right in position' is the wordplay.
I cannot really understand how this works, but
'right' could be 'r' (common abbreviation) and 'r' is located in the answer.
'position' could be 'pose' (synonyms) and 'pose' is located in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for prose that I've seen before include "Non-verse" , "Normal written language" , "Writings not in verse" , "Literary genre" , "Ordinary writing" .)