Feeling transmitted about new magazine (9)
I believe the answer is:
sentiment
'feeling' is the definition.
(I've seen this before)
'transmitted about new magazine' is the wordplay.
'transmitted' becomes 'sent' (sending is a kind of transmitting).
'about' is an insertion indicator.
'new' becomes 'n'.
'magazine' becomes 'time' (US magazine).
'n'+'time'='ntime'
'sent' placed around 'ntime' is 'SENTIMENT'.
(Other definitions for sentiment that I've seen before include "Test men in, say, emotion" , "Emotion, self-indulgent or insincere perhaps" , "Tender feeling" , "View, opinion, feeling" , "Tender or romantic emotion" .)