Creative ain't curt, just aloof (8)
I believe the answer is:
taciturn
'aloof' is the definition.
(I've seen this before)
'creative ain't curt' is the wordplay.
'creative' is an anagram indicator.
'aint'+'curt'='aintcurt'
'aintcurt' anagrammed gives 'TACITURN'.
'just' acts as a link.
(Other definitions for taciturn that I've seen before include "Reserved, saying little" , "Reticent" , "Tending to silence" , "Disinclined towards conversation" , "Habitually uncommunicative, saying little" .)