Boy knocked over told fibs and dawdled (7)
I believe the answer is:
dallied
'dawdled' is the definition.
(I've seen this before)
'boy knocked over told fibs' is the wordplay.
'boy' becomes 'lad' (lad is a kind of boy).
'knocked over' shows that the letters should be reversed in order.
'told fibs' becomes 'lied' (I've seen this before).
'lad' written backwards gives 'dal'.
'dal'+'lied'='DALLIED'
'and' is the link.
(Other definitions for dallied that I've seen before include "Held back" , "Idled or flirted" , "Idled, loitered" , "moved slowly" , "Hung about" .)