Knowing someone like you for starters (3)
I believe the answer is:
sly
'knowing' is the definition.
(I've seen this in other clues)
'someone like you for starters' is the wordplay.
'for starters' indicates taking the first letters.
The initial letters of 'someone like you' is 'SLY'.
(Other definitions for sly that I've seen before include "Doing things in unpleasant and secret way" , "Cunning, deceitful" , "Sneaky" , "Wily, shifty" , "Cunning, foxy" .)