A short way with fixed routine support (5)
I believe the answer is:
strut
'support' is the definition.
(strut is a kind of support)
'a short way with fixed routine' is the wordplay.
'a short way' becomes 'st' (abbreviation for street; 'short' suggests a short form).
'with' means one lot of letters go next to another.
'fixed routine' becomes 'rut' (I've seen this in another clue).
'st'+'rut'='STRUT'
(Other definitions for strut that I've seen before include "Display arrogance" , "Walk proudly like bantam-cock" , "Walk proudly like peacock" , "parade" , "Walk proudly; brace" .)