Prior to lunchtime I'm returning home with recipe for soup (10)
I believe the answer is:
minestrone
'for soup' is the definition.
(minestrone is a kind of soup)
'prior to lunchtime i'm returning home' is the wordplay.
'prior to' means one lot of letters go next to another.
'lunchtime' becomes 'rone' (I am not sure about this - if you are sure you should believe this answer much more).
'returning' is a reversal indicator.
'home' becomes 'nest' (a bird's home).
'im' written backwards gives 'mi'.
'mi'+'nest'='minest'
'rone' after 'minest' is 'MINESTRONE'.
'with recipe' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for minestrone that I've seen before include "Item on menu" , "liquid mixture" , "Italian soup" , "A starter" , "F" .)