Exactly in the direction of landlady (2,3,6)

I believe the answer is:

to the letter

I'm a little stuck... Click here to teach me more about this clue!

'exactly' is the definition.
(I've seen this before)

'in the direction of landlady' is the wordplay.
'in' indicates putting letters inside.
'direction of' becomes 'ot' (I am not sure about this - if you are sure you should believe this answer much more).
'landlady' becomes 'letter' (someone who 'lets').
'the' going around 'ot' is 'tothe'.
'tothe'+'letter'='TO THE LETTER'

Can you help me to learn more?

(Other definitions for to the letter that I've seen before include "how should tenant's rent be paid?" , "Exact in every detail" , "Accurately" , "giving every detail" , "Following every detail" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.