Bottom line of professional seizure (6)
I believe the answer is:
profit
'bottom line' is the definition.
The answer and definition can be both related to property as well as being singular nouns.
Maybe there's an association between them I don't understand?
'professional seizure' is the wordplay.
'professional' becomes 'pro' (abbreviation).
'seizure' becomes 'fit' (fit is a kind of seizure).
'pro'+'fit'='PROFIT'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for profit that I've seen before include "Gain, return on investment" , "financial advantage" , "bonus" , "Money made" , "returns" .)