A reduction in childcare sadly, I see, indicating superficial interest in new ideas (7,4)
I believe the answer is:
radical chic
'superficial interest in new ideas' is the definition.
(adopting radical ideas because they're fashionable)
'a reduction in childcare sadly i see' is the wordplay.
'reduction in' means to remove the last letter (the number of letters in the word is reduced).
'sadly' is an anagram indicator.
'see' becomes 'C' (the word for the letter, according to Chambers).
'childcare' with its final letter removed is 'childcar'.
'a'+'childcar'='achildcar'
'achildcar' is an anagram of 'radicalch'.
'radicalch'+'i'+'c'='RADICAL CHIC'
'indicating' acts as a link.
(Other definitions for radical chic that I've seen before include "Fashionable left-wing style" , "Fashionable extremism" , "Fashionable left-leaning style" .)