Row about one's happiness (8)
I believe the answer is:
paradise
'happiness' is the definition.
(I've seen this before)
'row about one's' is the wordplay.
'row' becomes 'parade' (as in a 'parade of shops'**).
'about' indicates putting letters inside.
'one's' becomes 'is' (Roman numeral).
'parade' going around 'is' is 'PARADISE'.
(Other definitions for paradise that I've seen before include "perfect place" , "a state of bliss" , "Heaven, nirvana, Valhalla etc" , "heavenly destination" , "Place of utter bliss" .)