Thanks chrise, jazzgirl and rusty.
I think I''ll go with UNCLASPS.
As jazzgirl states....one possible answer from an online dictionary gives as examples...."release the grip of".
"I unclasped her fingers from my hair".
The clue 'Loosens a grip' suggests the answer is to do with the hands.
I'll cover all bases though by writing UNCLAMPS in red ink outside the grid, stating that this is a possible alternative answer.
As chrise has stated...it's a poor clue which is par for the course with the Daily Record.