Follows Ulster, beaten by foremost of sides (7)
I believe the answer is:
results
'follows' is the definition.
(result can mean to ensue or follow)
'ulster beaten by foremost of sides' is the wordplay.
'beaten' is an anagram indicator (letters beaten up or destroyed).
'by' is a charade indicator (letters next to each other).
'foremost of' says to take the initial letters.
The first letter of 'sides' is 's'.
'ulster' is an anagram of 'result'.
'result'+'s'='RESULTS'
(Other definitions for results that I've seen before include "Outcomes, final scores" , "Outcomes, upshots" , "Exam marks" , "Outcomes, consequences" , "Outcomes, effects" .)