Inch worm (5)
I believe the answer is:
creep
I believe this is a double definition.
'inch' is the first definition.
(I've seen this before)
'worm' is the second definition.
(thesaurus)
(Other definitions for creep that I've seen before include "Slink" , "Advance slowly and stealthily" , "snake" , "Slow motion" , "Steal" .)