Digital defect in ohmmeter, to be repaired around one (9)

I believe the answer is:

hammertoe

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'digital defect' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'ohmmeter to be repaired around one' is the wordplay.
'to be repaired' indicates anagramming the letters.
'around' means one lot of letters goes inside another.
'one' becomes 'a'.
'ohmmeter' is an anagram of 'hmmertoe'.
'hmmertoe' going around 'a' is 'HAMMERTOE'.

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Hindu.

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