Insight of a retired nurse once dividing goods for sale (9)
I believe the answer is:
awareness
'insight' is the definition.
(I've seen this before)
'a retired nurse once dividing goods for sale' is the wordplay.
'retired' is a reversal indicator.
'nurse once' becomes 'SEN' (abbreviation for state-enrolled nurse).
'dividing' is an insertion indicator (inserted letters divide the word).
'goods for sale' becomes 'wares' (I've seen this in another clue).
'sen' in reverse letter order is 'nes'.
'nes' inserted within 'wares' is 'wareness'.
'a'+'wareness'='AWARENESS'
'of' is the link.
(Other definitions for awareness that I've seen before include "understanding" , "Perception" , "Knowledge (of a fact)" , "Mindfulness, consciousness" , "Grasp" .)