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Start to jeer, with pressure on workers (4,2)

Ross

I believe the answer is:

boot up

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'start' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'jeer with pressure on workers' is the wordplay.
'jeer with' becomes 'boo' (I've seen this in another clue. I am not sure about the 'with' bit.).
'pressure' becomes 'p' (abbreviation).
'on' is a charade indicator (letters next to each other).
'workers' becomes 'tu' (abbreviation for trade union).
'p' put after 'tu' is 'tup'.
'boo'+'tup'='BOOT UP'

'to' acts as a link.

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I've seen this clue in The Times.
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