Town with pier one has left abandoned, somewhere in Wales? (7)
I believe the answer is:
newport
'in wales?' is the definition.
('Newport' is part of 'wales')
'town with pier one has left abandoned' is the wordplay.
'with' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'has left' suggests deleting specific letters.
'abandoned' is an anagram indicator (the original order is abandoned).
'town' going around 'pier' is 'towpiern'.
'towpiern' with 'i' taken away is 'towpern'.
'towpern' anagrammed gives 'NEWPORT'.
'somewhere' is the link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for newport that I've seen before include "Welsh town" , "- - , IOW or RI" , "Welsh city on the Usk" , "Major IOW town" , "harbour town" .)