What you did with the bait the day you fished? (7)
I believe the answer is:
dangled
'what you did with the bait' is the definition.
I can't tell whether this defines the answer.
'day you fished?' is the wordplay.
I cannot quite understand how this works, but
'day' could be 'd' (abbreviation for day) and 'd' is found within the answer.
'fished?' could be 'angled' ('angle' can be a synonym of 'fish') and 'angled' is found within the answer.
No letters remain.
This explanation may well be incorrect...
'the' is the link.
Can you help me to learn more?
(Other definitions for dangled that I've seen before include "suspended" , "Hung" , "was on gibbet?" .)