Again take forbidden fruit for frankincense, say (5)
I believe the answer is:
resin
'frankincense say' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'again take forbidden fruit' is the wordplay.
'again' becomes 're' (prefix meaning 'again').
'take' means one lot of letters go next to another.
'forbidden fruit' becomes 'sin' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
're'+'sin'='RESIN'
'for' is the link.
Can you help me to learn more?
(Other definitions for resin that I've seen before include "It's obtained from tree-sap" , "Myrrh, for instance" , "It exudes from pines" , "frankincense, for instance?" , "plastic material" .)