Lag behind (5)
'lag behind' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trail that I've seen before include "Track or scent used in following someone" , "Beaten path; be in losing position" , "Rough track blazed through wild or hilly country" , "Path or track through wild or hilly country" , "Drag; path" .)
'lag behind' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for dawdle that I've seen before include "Dally" , "Walk along idly, take your time" , "Hang back, waste time" , "Idle along" , "Move slowly and lazily" .)