Cryptic Uk placenames

[theboytippex]

Shield with letter in the middle (9)
Harrison is in a pop group (7)
Returning bird with organic compound (9)
Sounds like a sizzler (6)
Cumbrian town housing Leith, Morpeth and Penrith (10)

Thanks in advance guys

[bibblebub]

2 Wrexham = rex in Wham!
3 Worcester = crow backwards + ester

[sandyRoe]

4 Bangor?

[Dilbert53]

Sh eff ield