Crossword Genius

Thwarting the nail's desire not to be hammered home? (8,2,3,4)

Ross

I believe the answer is:

knocking on the head

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

'thwarting the nail's desire' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'not to be hammered home?' is the wordplay.
I cannot quite see how this works, but
an anagram of 'not' is 'ont' which is located in the answer.
'be' could be 'head' (heading is a kind of being) and 'head' is located in the answer.
'home?' could be 'in' (to be in is to be (at) home) and 'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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