Day ends in anger for Dominican perhaps (5)
I believe the answer is:
friar
'for dominican perhaps' is the definition.
(dominican is a kind of friar)
'day ends in anger' is the wordplay.
'day' becomes 'fri' (abbreviation for Friday).
'ends in' means to remove the middle letters (only the letters at the ends of the words).
'anger' with its middle removed is 'ar'.
'fri'+'ar'='FRIAR'
(Other definitions for friar that I've seen before include "Male member of a mendicant religious order" , "Father" , "Religious brother" , "Eg, a Dominican" , "Monk perhaps" .)