Agriword

[Windy]

Just stuck on the last one! Ms McCafferty writes the cardinal at length (4) N??L - please help really stumped!

[factor-fiction]

Nell?

[kariah]

nail?

[douglas9401]

Nell? N - North, el - an old measure + l - length

[factor-fiction]

NBell McCafferty does write (she's a journalist/author) and the cardinal could be N or NE and length could be EL or L, but I don't see all the wordplay for NELL.
Douglas- the stated clue doesn't mention a measure other than length but you have used both EL and L in your solution.

[douglas9401]

Don't care factor (may I call you factor?), I've got my first "best answer". :P

[factor-fiction]

S'not fair- I said Nell first...

[douglas9401]

Aye, but you followed it up with a(n) NBell. :)