Creep from Altrincham (4)
I believe the answer is:
inch
'creep' is the definition.
(I've seen this before)
'from altrincham' is the wordplay.
'from' indicates the answer is hidden within the clue.
'INCH' is hidden within 'altrincham'.
(Other definitions for inch that I've seen before include "Creep, edge" , "Linear measure" , "no great length" , "Move very slowly - a very short distance" , "nose" .)