Kid runs into club (4)
I believe the answer is:
brat
'kid' is the definition.
(I know that brat is a type of imp)
'runs into club' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'into' indicates putting letters inside.
'club' becomes 'bat' (as in sporting equipment).
'r' placed inside 'bat' is 'BRAT'.
(Other definitions for brat that I've seen before include "child - that's a nuisance" , "Bad child - pack member!" , "Very dry" , "Brash young type" , "Spoilt kid" .)