Toady - one who moves slowly (7)
I believe the answer is:
crawler
'toady one who moves slowly' is the definition.
'crawler' can be an answer for 'toady' (synonyms). I am not sure about the remainder of the definition.
'toady one who moves' is the wordplay.
'toady' becomes 'crawl' (toady can mean to crawl or act sycophantically).
'one who moves' becomes 'er' (I can't justify this - if you can you should believe this answer much more).
'crawl'+'er'='CRAWLER'
Can you help me to learn more?
(Other definitions for crawler that I've seen before include "Obsequious person" , "Figure that's greasy" , "Internet search program" , "Sycophant" , "Minion" .)