One sentenced to go from Los Angeles to Gateshead? (3)

I believe the answer is:

lag

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'one sentenced to go' is the definition.
I can't tell whether this defines the answer.

'los angeles to gateshead?' is the wordplay.
'los angeles' becomes 'LA' (abbreviation).
'to gateshead?' becomes 'g' (head letter of 'gates').
'la'+'g'='LAG'

'from' is the link.

Can you help me to learn more?

(Other definitions for lag that I've seen before include "An old one is a convict" , "Fall behind; insulate" , "Convict (slang)" , "Ex-convict" , "Wrap to protect from frost" .)

I've seen this clue in the Evening Standard.

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