Drew up without one being uncanny (5)
I believe the answer is:
weird
'being uncanny' is the definition.
(synonyms)
'drew up without one' is the wordplay.
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'one' becomes 'i' (Roman numeral).
'drew' in reverse letter order is 'werd'.
'werd' going around 'i' is 'WEIRD'.
(Other definitions for weird that I've seen before include "Rum" , "Quirky" , "Uncanny, bizarre" , "behaving erratically?" , "Strange, peculiar" .)