Crossword Genius

Unfriendly, possibly rash hothead (5)

Ross

I believe the answer is:

harsh

'unfriendly' is the definition.
(thesaurus)

'possibly rash hothead' is the wordplay.
'possibly' indicates anagramming the letters.
'hothead' becomes 'h' (head letter of 'hot').
'rash' anagrammed gives 'hars'.
'hars'+'h'='HARSH'

(Other definitions for harsh that I've seen before include "Draconian" , "Strict, unfair" , "Guttural" , "Jarring" , "Rough and disagreeable, maybe of voice" .)

I've seen this clue in the Evening Standard.
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