Crossword Genius

Sub has left for a bar (1,4)

Ross

I believe the answer is:

u bolt

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

'sub has left' is the definition.
The definition suggests a singular noun which matches the answer.

'a bar' is the wordplay.
I cannot really understand how this works, but
'bar' could be 'bolt' (bolt is a kind of bar) and 'bolt' is found in the answer.
A single letter 'u' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'for' acts as a link.

Can you help me to learn more?

(Other definitions for u bolt that I've seen before include "fastest-ever human" , "Fastener" , "one holds a connection" , "Means of fixing" , "Bent retainer" .)

I've seen this clue in The Times.
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