Odd tangle I clear up (8)
I believe the answer is:
peculiar
'odd' is the definition.
(I know that odd can be written as peculiar)
'tangle i clear up' is the wordplay.
'tangle' indicates anagramming the letters.
'i'+'clear'+'up'='iclearup'
'iclearup' with letters rearranged gives 'PECULIAR'.
(Other definitions for peculiar that I've seen before include "Strange, different from the norm" , "Strange or eccentric, quite odd" , "Characteristic" , "Out of the ordinary" , "Odd, rum, funny" .)