Something one has to have when pro is in a mess? (9)
I believe the answer is:
ownership
'something one has to' is the definition.
I can't tell whether this definition defines the answer.
'when pro is in a mess?' is the wordplay.
'in a mess?' indicates an anagram (I've seen 'in a mess' mean this).
'when'+'pro'+'is'='whenprois'
'whenprois' is an anagram of 'OWNERSHIP'.
'have' acts as a link.
Can you help me to learn more?
(Other definitions for ownership that I've seen before include "Legal title" , "The right of possessing something" , "Proprietorship, possession" , "Proprietary right of possession" .)