Small nail with sharp end carefully located (10)

I believe the answer is:

pinpointed

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'carefully located' is the definition.
'pinpointed' can be an answer for 'located' (pinpointing is a kind of locating). I am not certain of the 'carefully' bit.

'small nail with sharp end' is the wordplay.
'small nail' becomes 'pin' (a pin is a small nail or tack).
'with sharp end' becomes 'pointed' (describing something pointy).
'pin'+'pointed'='PINPOINTED'

Can you help me to learn more?

I've seen this clue in The Guardian.

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