Found it!
2D def'n = 'in abundance'
5D - see posts above for help, def'n = 'up', 1 extra letter
9D - I have an answer but couldn't parse it, sorry (1 extra letter) - interested to see what anyone else thinks
10 - anag + 1 extra letter, def'n = 'starter'
12A - 2 extra letters, def'n = end of clue
Hope this helps.