Crossword Genius

National lottery uncovered lapses of vigilance (11)

Ross

I believe the answer is:

attentional

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

'national lottery uncovered lapses' is the definition.
I can't judge whether this defines the answer.

'vigilance' is the wordplay.
I cannot quite see how this works, but
'vigilance' could be 'attention' (I've seen this before) and 'attention' is found within the answer.
This explanation may well be incorrect...

'of' is the link.

Can you help me to learn more?

I've seen this clue in The Hindu.
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