Extraordinary (10)
There are a few possibilities for this:
'extraordinary' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for marvellous that I've seen before include "Fantastic" , "def" , "inspiring wonder" , "causing great wonder" , "Amazing" .)
'extraordinary' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for remarkable that I've seen before include "Extraordinary" , "unusual" , "Noteworthy" , "A wrongly-graded exam paper" , "surprising?" .)
'extraordinary' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for phenomenal that I've seen before include "Extraordinary - help one man (anag)" , "Amazing" , "Incredible" , "Mind-blowing" , "Stunning" .)
'extraordinary' is the definition.
(associated in meaning)
This is the entire clue.
(Other definitions for unusual that I've seen before include "Peculiar" , "That's odd" , "Infrequent" , "Extraordinary!" , "Odd - rare" .)
'extraordinary' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for abnormal that I've seen before include "Not typical or usual" , "Peculiar, unnatural" , "Highly unusual" , "Freakish" , "Unorthodox" .)
'extraordinary' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for preternatural that I've seen before include "Weird - extraordinary" , "Abnormal" , "Very unusual" , "beyond what's normal" .)