Creep left in team (5)
I believe the answer is:
sidle
'creep' is the definition.
(both can mean to move secretly or quietly)
'left in team' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' means one lot of letters goes inside another.
'team' becomes 'side' (both can mean a sports team).
'l' placed within 'side' is 'SIDLE'.
(Other definitions for sidle that I've seen before include "Walk stealthily" , "Walk obliquely" , "Slide (anag.)" , "Walk crabwise" , "Walk sideways like crab" .)