Peculiar male following rugby union (3)
I believe the answer is:
rum
'peculiar' is the definition.
('rum' can be a synonym of 'peculiar')
'male following rugby union' is the wordplay.
'male' becomes 'm' (common abbreviation).
'following' is a charade indicator (letters next to each other).
'rugby union' becomes 'ru'.
'm' put after 'ru' is 'RUM'.
(Other definitions for rum that I've seen before include "Pirate's grog" , "Funny" , "Odd like drink distilled from molasses" , "Sugar-cane product" , "Odd, like sailor's drink" .)