Promised a choice of three directions (5)
I believe the answer is:
sworn
'promised a choice' is the definition.
'sworn' can be an answer for 'promised' (I've seen this before). I am unsure of the 'a choice' bit.
'three directions' is the wordplay.
'three directions' can mean three replacements for 'direction'.
'direction' becomes 's' (S is an example).
'direction' becomes 'wor' (I can't justify this - if you can you should believe this answer much more).
'direction' becomes 'N' (compass direction north).
's'+'wor'+'n'='SWORN'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for sworn that I've seen before include "confirmed in office" , "promised" , "Stated on oath" , "Affirmed" , "Given under oath" .)