Entertainment that's a nice change to mother (6)
I believe the answer is:
cinema
'entertainment' is the definition.
(I've seen this before)
'nice change to mother' is the wordplay.
'change' is an anagram indicator.
'to mother' becomes 'ma' (ma can mean mother).
'nice' is an anagram of 'cine'.
'cine'+'ma'='CINEMA'
'that's a' acts as a link.
(Other definitions for cinema that I've seen before include "Movie-house" , "(Building for) film" , "Odeon perhaps" , "(Building showing) films" , "Iceman (anag)" .)