Were all different, as a random drive round showed (6)

I believe the answer is:
varied
'were all different' is the definition.
I can't judge whether this defines the answer.
'a random drive round showed' is the wordplay.
'a random' indicates an anagram.
'round' is an insertion indicator.
'showed' becomes 'a' (I am not sure about this - if you are sure you should believe this answer much more).
'drive' with letters rearranged gives 'vried'.
'vried' going around 'a' is 'VARIED'.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for varied that I've seen before include ".Made or became different" , "Widely different" , "Assorted, diverse" , "Of different sorts, diverse" , "Of different kinds" .)
