A verse on old rogue initially ordering fruit (7)
I believe the answer is:
avocado
'fruit' is the definition.
(I know that avocado is a type of fruit)
'a verse on old rogue initially ordering' is the wordplay.
'verse' becomes 'v'.
'on old' becomes 'o' (abbreviation as in OT - Old Testament. I am not sure about the 'on' bit.).
'rogue' becomes 'cad' (I've seen this in another clue).
'initially' indicates taking the first letters.
The first letter of 'ordering' is 'o'.
'a'+'v'+'o'+'cad'+'o'='AVOCADO'
Can you help me to learn more?
(Other definitions for avocado that I've seen before include "Green-fleshed fruit" , "Large-stoned pear-shaped fruit" , "slightly green" , "Pulpy fruit" , "A fruit; a dull green" .)