He has three in the bundle (7)
I believe the answer is:
patrick
'the bundle' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?
'he has three' is the wordplay.
'he' becomes 'pat' (I've seen this before).
'has three' becomes 'rick' (I can't explain this - if you can you should believe this answer much more).
'pat'+'rick'='PATRICK'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for patrick that I've seen before include "Irish patron saint" , "Name" , "- - Swayze: film actor" , "Patron saint who said 'Shoo!' to serpents" , "Patron saint of Ireland" .)