Help Plz. Thank You

[mightyquin]

Cryptic
2D Shape of university in Welsh town (5) ? O ? L ?
3D Fragment, small and tough (5)? ? ? R ?
4D Devise your first gym activity in safety enclosure (7) ? ? ? ? P E N
8D Detachment of Gurkhas initially sent into Asia perhaps (10) ? ? ? T ? ? ? E ? T
18D Bird has tailless feline in its throat (5) ? A ? ? ?
7A Lovely starter swallowed by terribly hairy girl (6) ? ? ? ? ? ?
10A Thug turns one boy upside down and cuts another short ((5) ? ? ? ? ?
17A A one - off time period (4) ? E ? ?

[Neveracrossword]

3 Shard, fragment. S(mall) +Hard.

[Helewel]

10 yobbo

[Captain2]

7a Hilary - anagram of 'hairy' + L(ovely) starter

[Neveracrossword]

18 Macaw, bird. Ca(t) inside Maw, mouth.

[Mamyalynne]

2 Mo U ld

[Captain2]

4 Playpen

[Flonska]

17a Aeon (anag of a one)

[Mamyalynne]

8 Contin G ent

[fiction-factory]

Any more letters for 17a please? Time period could be year but doesn't explain the first bit of the clue

[Flonska]

8d Contingent

[fiction-factory]

aeon is right

[Flonska]

Thank you FF :-)

[Mamyalynne]

Wibble.

[Flonska]

Thank you for the BA - much appreciated :-)