At any time that is weird (5)
I believe the answer is:
eerie
'weird' is the definition.
(both can mean strange or unsettling)
'at any time that is' is the wordplay.
'at any time' becomes 'eer' (archaic or poetic word meaning ever or forever).
'that is' becomes 'i.e.' (synonyms).
'eer'+'ie'='EERIE'
(Other definitions for eerie that I've seen before include "Strange, frightening" , "Awesome" , "Strange, unusual" , "Frighteningly odd" , "Oddly frightening" .)