Big meal and no drink? Hard to tuck into that (4-2)
I believe the answer is:
nosh-up
This clue might be a double definition.
'big meal' is the first definition.
'nosh-up' can be an answer for 'meal' (nosh-up is a kind of meal). I'm not certain of the 'big' bit.
'no drink? hard to tuck into that' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'and' is the link.
Can you help me to learn more?
(Other definitions for nosh-up that I've seen before include "Large meal (informal)" , "Large meal (colloq.)" , "Satisfying meal" , "Big meal (slang)" , "Good meal (informal)" .)