Creep in small lounge (5)
I believe the answer is:
sidle
'creep' is the definition.
(I've seen this before)
'small lounge' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'lounge' becomes 'idle' (I've seen this before).
's'+'idle'='SIDLE'
'in' is the link.
(Other definitions for sidle that I've seen before include "Inch along" , "Walk crabwise" , "sidewalk" , "Move like a crab" , "Isled (anag.)" .)