Dribble by defender and lose position (4,4)

'lose position' is the definition.
(as in dropping back in a race)

'dribble by defender' is the wordplay.
'dribble' becomes 'drop' (both can mean a small amount of liquid).
'by' means one lot of letters go next to another.
'defender' becomes 'back' (left-backs and right-backs are football defenders).
'drop'+'back'='DROP BACK'

'and' acts as a link.