Take up residence in the clubhouse perhaps as Masters' leader goes onto range holding iron initially (4,2)
I believe the answer is:
move in
'the clubhouse perhaps as masters' leader goes onto range holding iron initially' is the definition.
I can't judge whether this defines the answer.
'take up residence in' is the wordplay.
'take up residence' becomes 'move' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'move'+'in'='MOVE IN'
Can you help me to learn more?
(Another definition for move in that I've seen is " Take up new home".)