Crossword Genius

Great produces a foul -- sub sent off (8)

Ross

I believe the answer is:

fabulous

'great' is the definition.
(I've seen this before)

'a foul sub sent off' is the wordplay.
'sent off' indicates an anagram.
'a'+'foul'+'sub'='afoulsub'
'afoulsub' with letters rearranged gives 'FABULOUS'.

'produces' acts as a link.

(Other definitions for fabulous that I've seen before include "almost incredible" , "Ace" , "Marvellous, incredibly great" , "Legendary or wonderful" , "Smashing" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app