Position pawn next to a queen and king (4)
I believe the answer is:
park
'position' is the definition.
(parking is a kind of positioning)
'pawn next to a queen and king' is the wordplay.
'pawn' becomes 'p'.
'next to' means one lot of letters go next to another.
'queen' becomes 'r' (r is abbreviation regina. e.g. in ER ).
'and' means one lot of letters go next to another.
'king' becomes 'k' (**).
'p'+'a'+'r'+'k'='PARK'
(Other definitions for park that I've seen before include "Recreation ground" , "See 11 Across" , "See 1" , "Scottish explorer" , "Large public garden" .)