Intentionally (2,6)
'intentionally' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for on purpose that I've seen before include "Deliberately, with full intent" , "Oppose run with deliberate intention" , "Pours open - quite deliberately (2,7)" , "Deliberately, as intended" , "Deliberately, with firm intent (2.7)" .)
'intentionally' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for by design that I've seen before include "Intentionally" , "On purpose" .)