Jersey might be so closely integrated (7-4)

I believe the answer is:

tightly-knit

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This clue might be a double definition.

'jersey might be so' is the first definition.
(knitted item of clothing)

'closely integrated' is the second definition.
'tightly knit' can be an answer for 'integrated' (similar in meaning). I'm not certain of the 'closely' bit.

Can you help me to learn more?

I've seen this clue in The Times.

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