Plenty of pilots have not a bit of piety! (4)

I believe the answer is:

lots

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

'plenty' is the definition.
(I've seen this in another clue)

'pilots have not a bit of piety' is the wordplay.
'LOTS' is hidden within the letters.
But, I'm unsure how this is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for lots that I've seen before include "Large numbers at auction" , "Oodles" , "Large number or amount" , "Tons" , "Many found in slot" .)

I've seen this clue in the Evening Standard.

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