Serve drinks and observe broadcaster interrupting musicians (7)

I believe the answer is:

bartend

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'serve drinks' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'observe broadcaster interrupting musicians' is the wordplay.
'observe broadcaster' becomes 'rte' (I can't justify this - if you can you should give a lot more credence to this answer).
'interrupting' is an insertion indicator.
'musicians' becomes 'band' (group of musicians).
'rte' placed into 'band' is 'BARTEND'.

'and' is the link.

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I've seen this clue in The Irish Times.

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