Helen's lover to box out of bounds nobleman (10)

I believe the answer is:

aristocrat

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'bounds nobleman' is the definition.
'aristocrat' can be an answer for 'nobleman' (I've seen this before). I am not certain of the 'bounds' bit.

'helen's lover to box out' is the wordplay.
'helen's lover' becomes 'aristo' (I can't explain this - if you can you should give a lot more credence to this answer).
'to box' becomes 'crate' (crate is a kind of box).
'out' means to remove the last letter.
'crate' with its last letter taken away is 'crat'.
'aristo'+'crat'='ARISTOCRAT'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for aristocrat that I've seen before include "Nob" , "Noble" , "What's listed in Debrett" , "Nobleman" , "toff" .)

I've seen this clue in The Times.

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