Welsh town's tidy hotel (5)
I believe the answer is:
neath
'welsh town's' is the definition.
(I've seen this before)
'tidy hotel' is the wordplay.
'tidy' becomes 'neat' (synonyms).
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'neat'+'h'='NEATH'
(Other definitions for neath that I've seen before include "not on top" , "River" , "Welsh rugby club" , "Lower than - a town in West Glamorgan" , "Town NE of Swansea" .)