Extra fat butter? It's beneath e.g. lid made fancy (6-3,6)
I believe the answer is:
middle-age spread
'extra fat' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'butter? it's beneath e g lid made fancy' is the wordplay.
'butter?' becomes 'spread' (I've seen this before).
'it's beneath' means one lot of letters go next to another (in a down clue).
'fancy' indicates anagramming the letters.
'e'+'g'+'lid'+'made'='eglidmade'
'eglidmade' anagrammed gives 'middleage'.
'spread' put after 'middleage' is 'MIDDLE-AGE SPREAD'.
Can you help me to learn more?
(Other definitions for middle-age spread that I've seen before include "Weight gain in later life" , "Pot" , "Weight problem for those growing older" .)