Mother resents movement outside by director (9)
I believe the answer is:
steersman
'director' is the definition.
(thesaurus)
'mother resents movement outside' is the wordplay.
'mother' becomes 'ma' (ma is a kind of mother).
'movement' indicates an anagram.
'outside' is an insertion indicator.
'resents' anagrammed gives 'steersn'.
'ma' going inside 'steersn' is 'STEERSMAN'.
'by' acts as a link.
(Other definitions for steersman that I've seen before include "One at ship's helm" , "Chap at the helm" , "Guide for sea voyage" .)