Crossword Genius

Congratulatory message when the drilling operation is finished (8)

Ross

I believe the answer is:

welldone

I'm a little stuck... Click here to teach me more about this clue!

'congratulatory message when' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'drilling operation is finished' is the wordplay.
'drilling operation' becomes 'well' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'is finished' becomes 'done' (both can mean completed).
'well'+'done'='WELLDONE'

'the' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.
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