Struggling with this, surprisingly few posts, compared with Listener, which I finished on Sunday.
The three I've stared at unsuccessfully for longest are 1a, 12a, 26d.
There's an extra word to be removed from each clue.
1 Sentimentalism avoids term of endearment (5)
12 Fall out endlessly getting upset in uncharacteristic entanglement (5)
26 Ran and ran without support brassiere twisting (7)