Regularly adore a mother's excitement (5)
I believe the answer is:
drama
'excitement' is the definition.
(I've seen this before)
'regularly adore a mother's' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'mother' becomes 'ma' (ma is a kind of mother).
The alternate letters of 'adore' are 'dr'.
'dr'+'a'+'ma'='DRAMA'
(Other definitions for drama that I've seen before include "Theatrical production" , "Tragic situation" , "Play (as a genre)" , "Hamlet, say" , "shared interest of 6 & 12 [VERDI & SHAKESPEARE]" .)