Windbag spreads froth over king during light meal (12)
I believe the answer is:
blatherskite
'windbag' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'spreads froth over king during light meal' is the wordplay.
'spreads froth over' becomes 'lathers' (I can't explain this - if you can you should give a lot more credence to this answer).
'king' becomes 'K' (chess abbreviation).
'during' indicates putting letters inside.
'light meal' becomes 'bite' (I've seen this before).
'lathers'+'k'='lathersk'
'lathersk' placed inside 'bite' is 'BLATHERSKITE'.
Can you help me to learn more?
(Other definitions for blatherskite that I've seen before include "(Person talking) nonsense -- a Lettish berk (anag)" , "Chatterer" , "pants" , "fool" .)