Bandage major laceration on Tuesday (8)

'tuesday' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'bandage major laceration on' is the wordplay.
'bandage' becomes 'tu' (I can't explain this - if you can you should give a lot more credence to this answer).
'major' becomes 'big' (I've seen this in other clues).
'laceration' becomes 'rip' (I've seen this in another clue).
'on' means one lot of letters go next to another.
'tu'+'big'+'rip'='TUBIGRIP'

Can you help me to learn more?