Happening sometimes in so laconic a way (10)
I believe the answer is:
occasional
'happening' is the definition.
(thesaurus)
'so laconic a way' is the wordplay.
'way' indicates anagramming the letters (another way of arranging the letters).
'so'+'laconic'+'a'='solaconica'
'solaconica' with letters rearranged gives 'OCCASIONAL'.
'sometimes in' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for occasional that I've seen before include "Occurring at intervals" , "Occurring infrequently" , "Happening now and again" , "table may be of such a type" , "Periodical" .)