Sound unhappy with good cricket score, ton? (5)
I believe the answer is:
grunt
'sound unhappy' is the definition.
(to grunt is to make an unhappy sound)
'with good cricket score ton?' is the wordplay.
'with' says to put letters next to each other.
'good' becomes 'g' (abbreviation).
'cricket score' becomes 'run' (runs are scored in cricket).
'ton?' becomes 't' (abbreviation).
'g' next to 'run' is 'grun'.
'grun'+'t'='GRUNT'
(Other definitions for grunt that I've seen before include "Snort (like a pig)" , "(Make the) sound of a pig" , "Inarticulate sound" , "Beastly sound" , "Sound made by a pig" .)