Old bar staff in Murphy's I almost forgot to visit (8)

I believe the answer is:

tapsters

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'i almost forgot to visit' is the definition.
I can't tell whether this definition defines the answer.

'old bar staff in murphy's' is the wordplay.
'old bar staff' becomes 'ps' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'murphy's' becomes 'tater's' (informal term for a potato).
'ps' put into 'taters' is 'TAPSTERS'.

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I've seen this clue in The Independent.

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