It's apples mashed up with dried legumes? (5,4)
I believe the answer is:
split peas
'dried legumes?' is the definition.
'split-peas' can be an answer for 'legumes?' (split-pea is a kind of legume). I'm not sure about the 'dried' bit.
'it's apples mashed up' is the wordplay.
'mashed up' is an anagram indicator (I've seen this in other clues).
'its'+'apples'='itsapples'
'itsapples' with letters rearranged gives 'SPLIT PEAS'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for split peas that I've seen before include "What's in the soup" , "Dried vegetables" .)