1: All for naught, perhaps; not many upset (7)
2: Cryptic constructor, perhaps, dims somehow in value (9)
3: Cad mad about Dutch port (9)
4: How to eat the heart of marsupial (3)
5: Make southpaw north (5)
6: Cheaper oil, gas distributed in Island chains (13)
7: Senator mentioned housing trouble (7)
9: Fine legs confused emotions (5,8)
15: Form of address valued for the auditor taken unawares (9)
16: Old file is destroyed in valuable Arab lands (3,6)
17: Supplied new weapons for revolutionary dreamer (7)
20: Narrowly beat or oust one, oddly (4,3)
22: Blunder into tall African mammal, with no infrared (5)
25: Take Chair in university (3)