A king getting in close (4)
I believe the answer is:
akin
'close' is the definition.
(I've seen this before)
'a king getting in' is the wordplay.
'king' becomes 'K' (chess abbreviation).
'getting' says to put letters next to each other.
'a'+'k'+'in'='AKIN'
(Other definitions for akin that I've seen before include "Close" , "Related by blood" , "Similar in quality" , "Related or similiar" , "Of a similar nature" .)