Agree to limit consumption, getting a fine (3,3)
I believe the answer is:
not bad
'fine' is the definition.
(I've seen this before)
'agree to limit consumption getting a' is the wordplay.
'agree' becomes 'nod' (I've seen this before).
'to limit' indicates putting letters inside (outside letters limit or restrain others).
'consumption' becomes 'tb' (consumption is a name for TB or tuberculosis).
'getting' is a charade indicator (letters next to each other).
'tb'+'a'='tba'
'nod' enclosing 'tba' is 'NOT BAD'.
(Other definitions for not bad that I've seen before include "Middling (so good?)" , "Passable" , "Negative sort of praise, fairly good" , "Informally good, a bit grudging" , "Reasonably good in negative way" .)