Lottery money turns around heart of Humber area (7)
I believe the answer is:
tombola
'lottery' is the definition.
(tombola is a kind of lottery)
'money turns around heart of humber area' is the wordplay.
'money' becomes 'loot' (loot is a kind of money**).
'turns' says the letters should be written in reverse.
'around' means one lot of letters goes inside another.
'heart of' means to look at the middle letters.
'area' becomes 'a' (maths abbreviation).
The central letters of 'humber' are 'mb'.
'loot' reversed gives 'tool'.
'tool' placed around 'mb' is 'tombol'.
'tombol'+'a'='TOMBOLA'
(Other definitions for tombola that I've seen before include "Rotating drum game" , "Game often found at fetes" , "Lamb too (anag) - game with prizes" , "Fete game" , "Kind of lottery draw using a revolving drum" .)