Moved very slowly (6)
'moved very slowly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for inched that I've seen before include "Moved gradually" , "Moved by slow degrees" , "Moved in small increments" , "Moved along very slowly" .)
(Other definitions for crept that I've seen before include "cringed" , "was obsequious" , "Moved slowly with stealth and caution" , "Sneaked" , "Moved stealthily" .)