Treat ten dedicated insiders who were present (8)

I believe the answer is:

attended

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'were present' is the definition.
'attended' can be an answer for 'were' (attending is a kind of being). I'm not certain of the 'present' bit.

'treat ten dedicated insiders' is the wordplay.
'ATTENDED' is hidden in amongst the letters.
However, I'm unsure how this is indicated.

'who' is the link.

Can you help me to learn more?

(Other definitions for attended that I've seen before include "'Went to, was present at (8)'" , "Paid heed" , "Was present at or waited upon" .)

I've seen this clue in The Irish Times.

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