1: Take Chair in university (3)
2: The most artless nearly tack on undershirt (7)
3: Spy pinched mere fragments of treaty (9)
4: An inhabitant of Eastern Europe makes love nearer the middle (7)
5: Crave to badly ham it up (7)
6: I deem turds a regrettable necessity (11)
8: Rinse out pine compound (5)
10: Child is to depart, finally (3)
11: Incomplete raw data lies in largely unexplored regions (4,7)
15: Yonder string Hansard maintains (3,6)
17: Mr. Upton dressed, one suit being just like any other? (2-5)
18: Shes said to be funambulists best friend (7)
19: Earthenware bowl eventually replacing fragment of prehistoric drawing (7)
20: Entice substitute to drink. (5)
22: Ball tops over-ripe bananas (3)
25: However, you expect trouble at first (3)