Means I calculate the inside leg (6)

I believe the answer is:

inseam

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

'inside leg' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'means i calculate' is the wordplay.
'means i' can be anagrammed to 'INSEAM'.
However, I'm unsure how this is indicated.

'the' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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