Upset elderly accepting current rubbish (8)
I believe the answer is:
agitated
'upset' is the definition.
(thesaurus)
'elderly accepting current rubbish' is the wordplay.
'elderly' becomes 'aged' (synonyms).
'accepting' indicates putting letters inside (inserted letters are accepted).
'current' becomes 'I' (physics symbol).
'rubbish' becomes 'tat' (low-quality items or material).
'i'+'tat'='itat'
'aged' placed around 'itat' is 'AGITATED'.
(Other definitions for agitated that I've seen before include "Distressed" , "Distracted" , "Aroused - disturbed" , "On edge, anxious" , "Het up" .)