Lock-up porn is distributed (6)

Ross

I believe the answer is:

prison

I'm a little stuck... Click here to teach me more about this clue!

'lock-up' is the definition.
I can't judge whether this defines the answer.

'porn is distributed' is the wordplay.
'distributed' indicates an anagram.
'porn'+'is'='pornis'
'pornis' with letters rearranged gives 'PRISON'.

Can you help me to learn more?

(Other definitions for prison that I've seen before include "cage" , "Slammer" , "Clink - jug" , "punishment" , "Wormwood Scrubs, for example" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app