Loiter round lewd ad (6)
I believe the answer is:
dawdle
'loiter' is the definition.
(I've seen this in another clue)
'round lewd ad' is the wordplay.
'round' indicates an anagram.
'lewd'+'ad'='lewdad'
'lewdad' with letters rearranged gives 'DAWDLE'.
(Other definitions for dawdle that I've seen before include "Walk slowly and idly" , "Walk along idly, take your time" , "Wander along slowly" , "Dally" , "Hang back, waste time" .)