Powerful lady’s armchair repaired (about time!) (9)
I believe the answer is:
matriarch
'powerful lady's armchair repaired about time' is the definition.
I can't tell whether this defines the answer.
'armchair repaired about time' is the wordplay.
'repaired' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'time' becomes 't' (abbreviation).
'armchair' is an anagram of 'mariarch'.
'mariarch' going around 't' is 'MATRIARCH'.
Can you help me to learn more?
(Other definitions for matriarch that I've seen before include "Very old or venerable woman" , "Leading lady" , "venerable old lady" , "Woman dominating" , "Dominant female" .)