Occasionally super idea shows dash (10)
I believe the answer is:
sprinkling
'dash' is the definition.
(thesaurus)
'occasionally super idea' is the wordplay.
'occasionally' indicates alternate letters.
'idea' becomes 'inkling' (inkling is a kind of idea**).
The alternating letters of 'super' are 'spr'.
'spr'+'inkling'='SPRINKLING'
'shows' is the link.
(Other definitions for sprinkling that I've seen before include "Drizzling" , "trickle" , "Not much water" .)