Cortege, oddly quiet and slow movement (5)
I believe the answer is:
creep
'slow movement' is the definition.
(creep can mean a slow or sneaky movement)
'cortege oddly quiet' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
The alternating letters of 'cortege' are 'cree'.
'cree'+'p'='CREEP'
'and' acts as a link.
(Other definitions for creep that I've seen before include "Move slowly and stealthily" , "Cringing, unpleasant person (slang)" , "Move furtively" , "Sycophant" , "Tiptoe" .)