Terrible gale round Ulster and Nice? (6)
I believe the answer is:
genial
'nice?' is the definition.
(I've seen this in another clue)
'terrible gale round ulster' is the wordplay.
'terrible' is an anagram indicator.
'round' indicates putting letters inside.
'ulster' becomes 'NI' (Northern Ireland).
'gale' is an anagram of 'geal'.
'geal' enclosing 'ni' is 'GENIAL'.
'and' is the link.
(Other definitions for genial that I've seen before include "Mild and pleasant" , "Jolly" , "Friendly and agreeable" , "Affable in Ealing" , "relating to the chin" .)