Flipping old character embracing old mother in entrance (7)
I believe the answer is:
enamour
'entrance' is the definition.
(I know that entrance can be written as enamour)
'flipping old character embracing old mother' is the wordplay.
'flipping' says the letters should be written in reverse.
'old character' becomes 'rune' (ancient symbol).
'embracing' indicates putting letters inside.
'old' becomes 'o' (abbreviation as in OT - Old Testament).
'mother' becomes 'ma' (ma can mean mother).
'o'+'ma'='oma'
'rune' enclosing 'oma' is 'ruomane'.
'ruomane' backwards is 'ENAMOUR'.
'in' is the link.
(Other definitions for enamour that I've seen before include "entrance" , "Delight" , "Charm, captivate" , "Inspire with love; charm" , "Enchant" .)