Pure

[bluepork19]

3d.whaie showing limits of other cetacea(4)o?c?
5d.core of group,as a rule,mistakenly spurning second gold disc(7)a?r?o?a
6d.man getting very drunk following rounds(10)p?t?o?L?N?
7d.city also to unknown king after uprising(5)T?K?O
8d.pastry article in part of meal(6)D?N?S?
21d.course of action:one college absorbed into another(6)P?L?C?
thanks in advance

[bibblebub]

orca
aureola
patrolling
Tokyo
danish
policy

[jim360]

3d ORCA (OtheR CetaceA - limits = first and last letters).

5d AUREOLA (disc) = (o [core of group] + as a rule) anagrammed, minus the S (for second).

6d patrolling (following rounds) = pat + rolling

7d Tokyo (= too [also] about K[ing]+Y [unknown])

8d Danish = an (article) in dish

21d POLICY = I C[ollege] in Poly[technic].

[bluepork19]

thanks i missed 9d experience various changes,bar one(6)?A?O?R
thanks again

[frugalfred]

savour