Witness Grant in Derby disaster? (9)
I believe the answer is:
bystander
'witness' is the definition.
(I know that bystander is a type of witness)
'grant in derby disaster?' is the wordplay.
'grant' becomes 'stan' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'disaster?' is an anagram indicator (I've seen 'disaster' mean this).
'derby' with letters rearranged gives 'byder'.
'stan' inserted inside 'byder' is 'BYSTANDER'.
Can you help me to learn more?
(Other definitions for bystander that I've seen before include "Watcher of occurrence" , "Non-participant spectator" , "Bad sentry may be an onlooker" , "Non-partcipating spectator" , "Onlooker (often innocent)" .)