At home, poke grandma, having got tense and angry (9)
I believe the answer is:
indignant
'angry' is the definition.
('indignant' can be similar in meaning to 'angry')
'at home poke grandma having got tense' is the wordplay.
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'poke' becomes 'dig' ('dig' can be a synonym of 'poke').
'grandma' becomes 'nan' (I've seen this before).
'having got' means one lot of letters go next to another.
'tense' becomes 't' (abbreviation used in many dictionaries).
'in'+'dig'+'nan'+'t'='INDIGNANT'
'and' is the link.
(Other definitions for indignant that I've seen before include "Affronted by perceived injustice" , "Annoyed at unfair treatment" , "Angered by unjust treatment" , "Miffed" , "not happy" .)