Bulging in vessel with careless nurseryman not near (8)
I believe the answer is:
aneurysm
'bulging in vessel' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'careless nurseryman not near' is the wordplay.
'careless' indicates an anagram.
'not' suggests deleting specific letters.
'near' becomes 'nr' (abbreviation used in addresses).
'nurseryman' with 'nr' taken out is 'useryman'.
'useryman' is an anagram of 'ANEURYSM'.
'with' is the link.
Can you help me to learn more?
(Other definitions for aneurysm that I've seen before include "Swelling of a blood vessel" , "Artery wall swelling; nurse may (anagram)" , "Permanent abnormal enlargement of an artery" , "Widening of a blood vessel" , "Sac-like widening of an artery" .)