Space out extremely tedious features (7)
I believe the answer is:
aspects
'features' is the definition.
(aspect is a kind of feature)
'space out extremely tedious' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'extremely' says to hollow out the word (remove centre letters).
'tedious' with its middle taken out is 'ts'.
'space' is an anagram of 'aspec'.
'aspec'+'ts'='ASPECTS'
(Other definitions for aspects that I've seen before include "Views, vistas or facets" , "Points of view" , "Elements; views" , "Appearances presented by saps etc." , "Features (of a problem)" .)