No time left to tour Scottish island? That's fanciful (8)
I believe the answer is:
notional
'fanciful' is the definition.
('notional' can be a synonym of 'fanciful')
'no time left to tour scottish island?' is the wordplay.
'time' becomes 't'.
'left' becomes 'l' (common abbreviation**).
'to tour' indicates putting letters inside (to tour can mean to go around).
'scottish island?' becomes 'iona' (I've seen this before).
't'+'l'='tl'
'tl' going around 'iona' is 'tional'.
'no'+'tional'='NOTIONAL'
'that's' acts as a link.
(Other definitions for notional that I've seen before include "Theoretic" , "Existing as theory, not existing in reality" , "Speculative, not based on fact" , "Hypothetical, imaginary" , "Assumed to be correct for particular purpose, say estimate" .)