Squeeze in to tank having larger dimensions than normal (5-4)

I believe the answer is:

queen-size

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'normal' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

'squeeze in to tank having larger dimensions' is the wordplay.
'squeeze in' anagrams to 'QUEEN-SIZE'.
However, I'm unsure how the anagram is indicated.

'than' is the link.

Can you help me to learn more?

I've seen this clue in The Times.

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