Speaks harshly of making a pass at a redhead (5)
I believe the answer is:
rasps
'speaks harshly' is the definition.
(I've seen this in another clue)
'making a pass at a redhead' is the wordplay.
'making' indicates anagramming the letters.
'at' says to put letters next to each other (I've seen this in other clues).
'a redhead' becomes 'r' (the head/first letter of 'red').
'pass' with letters rearranged gives 'asps'.
'asps' after 'r' is 'RASPS'.
'of' is the link.
(Other definitions for rasps that I've seen before include "Coarse files" , "Scrapes" , "fruit briefly" , "Jars" , "Grates harshly" .)