Go ahead but do creep sort of (7)
I believe the answer is:
proceed
'go ahead' is the definition.
(I've seen this in another clue)
'do creep sort of' is the wordplay.
'sort of' indicates anagramming the letters.
'do'+'creep'='docreep'
'docreep' anagrammed gives 'PROCEED'.
'but' is the link.
(Other definitions for proceed that I've seen before include "Continue, go ahead" , "Move forward" , "Go forward" , "Continue; advance" , "Follow a certain course" .)