Part of UK covered by a Tyneside girl (5)
I believe the answer is:
annie
'girl' is the definition.
'part of uk covered by a tyneside' is the wordplay.
'part of uk' becomes 'ni' (Northern Ireland).
'covered by' is an insertion indicator.
'tyneside' becomes 'ne' (region in North East of England).
'a'+'ne'='ane'
'ni' put within 'ane' is 'ANNIE'.
(Other definitions for annie that I've seen before include "- Get your Gun, musical" , "Sharpshooter Oakley or musical orphan" , "Musical based on cartoon strip" , "Musical heroine" , "Inane (anag) - girl (with a gun?)" .)