Guerilla has a pastry dish, a reasonably priced thing (7)
I believe the answer is:
cheapie
'dish a reasonably priced thing' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'guerilla has a pastry' is the wordplay.
'guerilla has' becomes 'che' (I can't explain this - if you can you should give a lot more credence to this answer).
'pastry' becomes 'pie' (pie is a kind of pastry).
'che'+'a'+'pie'='CHEAPIE'
Can you help me to learn more?
(Other definitions for cheapie that I've seen before include "item knocked down?" , "something economical" , "Something inexpensive" .)