Drink eagerly (3,2)
I believe the answer is:
lap up
'drink eagerly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lap up that I've seen before include "Assimilate with relish" , "Delight" , "Relish (with the tongue?)" , "Scoop" , "Take in willingly (with the tongue?)" .)