Unskilled worker getting to grips with Heavy Metal is in charge of the party (6,6)

I believe the answer is:

labour leader

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'in charge of the party' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'unskilled worker getting to grips with heavy metal' is the wordplay.
'unskilled worker' becomes 'labourer' (I've seen this before).
'getting to grips with' means one lot of letters goes inside another.
'heavy metal' becomes 'lead' (I've seen this before).
'labourer' enclosing 'lead' is 'LABOUR LEADER'.

'is' is the link.

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I've seen this clue in the Irish Times.

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