Train wreck on the first of the month, in Ireland (6)
I believe the answer is:
antrim
'ireland' is the definition.
(I've seen this before)
'train wreck on the first of the month' is the wordplay.
'wreck' is an anagram indicator.
'on' means one lot of letters go next to another.
'the first of' indicates taking the first letters.
The initial letter of 'month' is 'm'.
'train' is an anagram of 'antri'.
'antri'+'m'='ANTRIM'
'in' acts as a link.
(Other definitions for antrim that I've seen before include "NI town" , "Giant's Causeway county" , "town in Ireland" , "County in Ireland's north-east" , "N Ireland county of green glens" .)