Add a dash of hype, then a diversion (9)
I believe the answer is:
hyphenate
'add a dash' is the definition.
I know that 'dash' relates to this answer.
'hype then a diversion' is the wordplay.
'diversion' indicates anagramming the letters.
'hype'+'then'+'a'='hypethena'
'hypethena' anagrammed gives 'HYPHENATE'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for hyphenate that I've seen before include "Make a dash" , "the line in three-legged race" , "with short line" , "Join two words with horizontal dash" , "Add dash" .)