Crossword Genius

Worse bit of hardware, it's a nightmare to set up (7)

Ross

I believe the answer is:

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

'worse bit of hardware it's a nightmare to set up' is the definition.
I can't tell whether this defines the answer.

'of hardware it's a nightmare to set up' is the wordplay.
'of' indicates a hidden word.
'to set up' says the letters should be written backwards.
'reitsan' is hidden in the letters of 'hardware its a nightmare'.
'reitsan' written backwards gives 'NASTIER'.

Can you help me to learn more?

(Other definitions for nastier that I've seen before include "more aggressive", "Retsina (anag) -- not so nice", "More unpleasant or distasteful", "More horrid", "More disgusting".)

I've seen this clue in The Telegraph.