Ms Arthur calls for directions (8)
I believe the answer is:
bearings
'for directions' is the definition.
(as in compass bearings)
'ms arthur calls' is the wordplay.
'ms arthur' becomes 'bea' (I am not sure about this - if you are sure you should believe this answer much more).
'calls' becomes 'rings' ('ring' can be a synonym of 'call').
'bea'+'rings'='BEARINGS'
Can you help me to learn more?
(Other definitions for bearings that I've seen before include "specific location" , "Compass directions or small balls in wheel hubs" , "(One's) orientation" , "Direction relative to N." , "Part of machine" .)