Times Book Of Crosswords

[barnaclebill58]

Please explain these to me .
1. Using the right approach, making cuts in what's planned. Ans cross sectional. I can sort of see it but not entirely.
2. Take vigorous action about swelling. Ans Goitre. I have been unable to find any support for "go it" meaning "take vigorous action". I'm assuming re is about.
3. Fall for it , at first . Ans Original sin. Again I sort of get it but I'd like a clear explanation.
4. So that is fundamental. Ans Prime (fundamental) but can't get the "so that is"
5. Verdict letting you loose , free, finally released . Ans not guilty. (First clue I solved) but just can't see the "free, finally released" part.

[Neveracrossword]

2 Go It, act in a striking or dashing manner, is what it says in Chambers so that seems fine.

[bookbinder]

2. 'go it' means: go for it! do it! It's an encouragement to do something vigorously.
https://www.collinsdictionary.com/dictionary/english/go-it

[Mamyalynne]

3

https://en.wikipedia.org/wiki/Fall_of_man

[Lie-in King]

5 Not guilty - anag 'l(e)tting you' ('[fre]e' finally, released)

[barnaclebill58]

I'd have to say that I have never heard anyone say "Go it".

That anagram was hard -thanks Lie-in King.

[bobbinwales]

number 4 is a puzzle.
The only way I can see the 'so that is' fitting in is that the 'that is' would give the i.e. bit but that still leave's the PRM.
Also i and e are the 3rd and 5th letters of PRIME and 3 and 5 are prime numbers...
Maybe the clue followed on from another one which referred to a prime number of maybe the clue number was a prime number.

These are certainly weirder than your average Times clue nowadays