Thorny, possibly sore point (5)
I believe the answer is:
roses
'thorny' is the definition.
The definition and answer are not the same part of speech.
'possibly sore point' is the wordplay.
'possibly' is an anagram indicator.
'point' becomes 's' (South).
'sore' anagrammed gives 'rose'.
'rose'+'s'='ROSES'
Can you help me to learn more?
(Other definitions for roses that I've seen before include "Fragrant flowers" , "Thorny shrubs with bright flowers" , "favours > certain wines" , "Occupants of bed" , "Flowers, usually red, pink, white or yellow" .)