A few circling wagon have initially found their target (6,4)

'found their target' is the definition.
(to strike home is to hit a target)

'a few circling wagon have initially' is the wordplay.
'a few' becomes 'some' (both can mean a small amount of something).
'circling' is an insertion indicator (circling can mean going around or containing).
'wagon' becomes 'truck'.
'have initially' becomes 'h' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'truck'+'h'='truckh'
'some' enclosing 'truckh' is 'STRUCK HOME'.

Can you help me to learn more?