Crawl (5)
I believe the answer is:
creep
'crawl' is the definition.
(I know that crawl can be written as creep)
This is the entire clue.
(Other definitions for creep that I've seen before include "Move softly and slowly like slangy servile person" , "Move silently and secretly" , "jerk?" , "Advance slowly and stealthily" , "Inch" .)