Creep lies about having daughter (5)
I believe the answer is:
sidle
'creep' is the definition.
(both can mean to move secretly or quietly)
'lies about having daughter' is the wordplay.
'about' indicates an anagram.
'having' means one lot of letters goes inside another.
'daughter' becomes 'd' (genealogical abbreviation).
'lies' anagrammed gives 'sile'.
'sile' going around 'd' is 'SIDLE'.
(Other definitions for sidle that I've seen before include "Walk stealthily" , "Walk obliquely" , "'Move sideways, furtively perhaps (5)'" , "Walk crabwise" , "Walk sideways in furtive manner" .)