Tied up in knots (5)
'tied up in knots' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tense that I've seen before include "past, say" , "Strained by time in grammar" , "Maybe future" , "edgy" , "Suffering from strain" .)
(Other definitions for tangled that I've seen before include "Twisted into confused mass" , "Intertwined" , "Complex" , "In a knotty mess" , "Convoluted" .)