Sorry for long absence all, its been a busy few weeks so this is the first time in ages I've managed the crossword and had anything to say.
My second thought on solving 5d was the Pink Floyd reference, I'm afraid for me this followed recall of Maggie's hideously misguided penal policy for young offenders. The other musical link (that I'm surprised nobody else has brought up) was the wonderful album by the very wonderful Texan Michelle [last word of 5d]ed, the album title is [5d]ed and it's well worth exploring her works, particularly this and 'Texas Campfire Tapes', and her back story. Comfortably deserves her place in company with the Mikado, Pink Floyd & Billy Bragg - I wouldn't be at all surprised if she had performed or recorded with Billy, who I'm looking forward to seeing (twice) at the end of the year