Crossword Genius

Maximum measure of digital protection? (10)

Ross

I believe the answer is:

thimbleful

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

'maximum measure' is the definition.
'thimbleful' can be an answer for 'measure' (thimbleful is a kind of measure). I'm not sure about the 'maximum' bit.

'digital protection?' is the wordplay.
I cannot really see how this works, but
'protection?' could be 'thimble' (thimble is a kind of protection) and 'thimble' is present in the answer.
The remaining letters 'ful' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times and The Sunday Times.
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