Writer's shoes sister regularly removed (5)
I believe the answer is:
hesse
'writer's' is the definition.
(I've seen this before)
'shoes sister regularly removed' is the wordplay.
'regularly removed' means one should take alternating letters (letters removed at regular intervals).
'shoes'+'sister'='shoessister'
The alternating letters of 'shoessister' are 'HESSE'.
(Other definitions for hesse that I've seen before include "Ger. state; Hermann ---, novelist" , "German state, capital Weisbaden" , "poet" , "German state, capital Wiesbaden" , "Hermann --, German writer" .)