Scottish grandchild back with lemon drink (7)
I believe the answer is:
oenomel
'scottish grandchild' is the definition.
The definition suggests a singular noun which matches the answer.
'back with lemon drink' is the wordplay.
'back' shows that the letters should be reversed in order.
'with' means one lot of letters go next to another.
'drink' becomes 'eo' (I can't justify this - if you can you should give a lot more credence to this answer).
'lemon' put next to 'eo' is 'lemoneo'.
'lemoneo' reversed gives 'OENOMEL'.
Can you help me to learn more?
(Other definitions for oenomel that I've seen before include "drink" , "sweet concoction" .)