Wants gentleman to have children back around (7)
I believe the answer is:
desires
'wants' is the definition.
('desire' can be a synonym of 'want')
'gentleman to have children back around' is the wordplay.
'gentleman' becomes 'sire'.
'to have children back' becomes 'des' (I can't explain this - if you can you should believe this answer much more).
'around' means one lot of letters goes inside another.
'sire' inserted into 'des' is 'DESIRES'.
Can you help me to learn more?
(Other definitions for desires that I've seen before include "Wants (7)." , "Wishes" , "Covets and yearns for" , "Hopes" , "needs" .)