For “odd”, the usual clue, I interposed, is “strange” (8)
I believe the answer is:
peculiar
'strange' is the definition.
('peculiar' can be a synonym of 'strange')
'for odd the usual clue i interposed' is the wordplay.
I cannot quite see how this works, but
an anagram of 'clue' is 'ecul' which is within the answer.
'i' could be 'a' and 'a' is present in the answer.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for peculiar that I've seen before include "Odd - individual" , "Odd, rum, funny" , "'Curious, odd (8)'" , "'Strange, odd (8)'" , "Unusual" .)