Write your name on letters for director (8)
I believe the answer is:
signpost
'for director' is the definition.
(I've seen this before)
'write your name on letters' is the wordplay.
I cannot quite understand how this works, but
'write' could be 'sign' (signing is a kind of writing) and 'sign' is found in the answer.
'letters' could be 'post' (letters in the mail or post) and 'post' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for signpost that I've seen before include "director" , "One may help you on your way" , "Postings (anag.)" , "It shows the way" , "this will give you directions" .)