Most Irish dancing is random (3-2-4)
I believe the answer is:
hit-or-miss
'random' is the definition.
(I've seen this before)
'most irish dancing' is the wordplay.
'dancing' is an anagram indicator.
'most'+'irish'='mostirish'
'mostirish' with letters rearranged gives 'HIT-OR-MISS'.
'is' is the link.
(Other definitions for hit-or-miss that I've seen before include "Of method, erratic or random" , "Haphazard, random" .)