... floored by tangle inside plug (6)
I believe the answer is:
amazed
'floored' is the definition.
(I've seen this in another clue)
'tangle inside plug' is the wordplay.
'tangle' becomes 'maze' (I've seen this in another clue).
'inside' indicates putting letters inside.
'plug' becomes 'ad' (as in plugging a product).
'maze' put within 'ad' is 'AMAZED'.
'by' acts as a link.
(Other definitions for amazed that I've seen before include "Staggered" , "Greatly surprised, never would have thought it" , "Astonished, astounded" , "Greatly surprised and impressed" , "Overwhelmed with wonder" .)