Expression of understanding [A bit imprecise – ed.] (1,3)
I believe the answer is:
i see
'expression of understanding' is the definition.
(I've seen this in another clue)
'a bit imprecise ed' is the wordplay.
'a bit' indicates the answer is hidden within the clue (I've seen 'bit of' mean this).
'I SEE' can be found hidden inside 'imprecise ed'.
(Other definitions for i see that I've seen before include "So that's the way the cookie crumbles!" , "Expression of dawning comprehension" , "Got it now!" .)