Chaotic time — went fishing (7)
I believe the answer is:
tangled
'chaotic' is the definition.
'time went fishing' is the wordplay.
'time' becomes 't' (abbreviation).
'went fishing' becomes 'angled' (I've seen this before).
't'+'angled'='TANGLED'
(Other definitions for tangled that I've seen before include "Complex" , "''Oh what a ... web we weave / when first we practise to deceive'' (Walter Scott)" , "D [Disney] made" , "Convoluted" , "Confusedly matted" .)