The big one

[wardlaw]

Last two. 29a reason, need. I have o-c---o-. Occasion?
30d short and broad. If 'occasion' is correct it would be s-u-t. Could it be stunt?
Grateful for any help/explanation.

[boomerang551]

occasion squat

[katburd]

I've put occasion and squat

[modeste]

30d stout

[katburd]

http://www.thefreedictionary.com/squat
if you scroll down to squat adj.1

[wardlaw]

Thank you all. I got squat just as I clicked on your answers. I will go to the pub now and hopefully a pint of pre-lunch Guinness will take me out of thick mode.

[katburd]

good for you! enjoy