Hi Roof,
12a - definition is "trouble for corporation" (problem of the tummy) - 5 letter word for "move into" + usual 2 letter abbr. for "computing" + IS
9a - definition is "refuse" (as in rubbish) - 5 letter word for "to fight" + 5 letter word for "little cash" minus it's first letter/losing face.
4d definition is "depressed area" - 2 letter interjection for "I don't know" reversed/about + 4 letter word for a "tax" (it's not a common one)
5d - definition is "fighter" (an aircraft) - 4 letter word for "inclines" reversed/to lift + 4 letter word for "sack"
Glass of wine, what an excellent idea:-)