Gloomy party you’re texting (4)
I believe the answer is:
dour
'gloomy' is the definition.
(I've seen this before)
'party you're texting' is the wordplay.
'party' becomes 'do' (do can informally mean a party).
'you're texting' becomes 'ur' (informal spelling of 'you're' eg in text messages).
'do'+'ur'='DOUR'
(Other definitions for dour that I've seen before include "Stern, humourless" , "Stubborn" , "Obstinate - grim" , "Sullen, severe" , "Stern and forbidding" .)