Something warming for Christmas decoration that's put up, for example on top (6)
I believe the answer is:
eggnog
'something warming for christmas' is the definition.
I can't tell whether this definition defines the answer.
'decoration that's put up for example on top' is the wordplay.
'decoration' becomes 'gong' (I've seen this before).
'that's put up' says the letters should be written in reverse.
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'on top' says to put letters next to each other (in a down clue, some letters go above others).
'gong' back-to-front is 'gnog'.
'gnog' put after 'eg' is 'EGGNOG'.
Can you help me to learn more?
(Other definitions for eggnog that I've seen before include "Drink which includes hot beer" , "Drink similar to advocaat" , "Punch made with eggs and alcohol" , "Winter cocktail" , "Xmas tipple" .)