Love god rebuffed by Romeo becomes increasingly irritated (5)
I believe the answer is:
sorer
'becomes increasingly irritated' is the definition.
I can't tell whether this defines the answer.
'love god rebuffed by romeo' is the wordplay.
'love god' becomes 'eros' (Greek god of love).
'rebuffed' says the letters should be written in reverse.
'by' says to put letters next to each other.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'eros' in reverse letter order is 'sore'.
'sore'+'r'='SORER'
Can you help me to learn more?
(Other definitions for sorer that I've seen before include "more resentful" , "more upset" , "More painful or vexed" , "Comparatively vexed" .)