Patriarch against wearing Hawaiian garland (4)
I believe the answer is:
levi
'patriarch' is the definition.
(I have seen 'Hebrew patriarch' mean 'levi' so perhaps 'patriarch' could also mean 'levi')
'against wearing hawaiian garland' is the wordplay.
'against' becomes 'v' (abbreviation for 'versus').
'wearing' indicates putting letters inside.
'hawaiian garland' becomes 'lei' (I've seen this in another clue).
'v' inserted inside 'lei' is 'LEVI'.
(Other definitions for levi that I've seen before include "Hebrew patriarch, son of Jacob" , "Jacob's son (OT)" , "Primo -, It. novelist" , "Tribe of Israel" , "Primo --, Italian writer and chemist" .)