Stop Hank starting trouble! (4)

I believe the answer is:

halt

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'stop' is the definition.
(halt can mean to stop)

'hank starting trouble' is the wordplay.
'starting' suggests taking the first letters.
'trouble' becomes 'alt' (I can't justify this - if you can you should give a lot more credence to this answer).
The initial letter of 'hank' is 'h'.
'h'+'alt'='HALT'

Can you help me to learn more?

(Other definitions for halt that I've seen before include "Falter - stop" , "Bring to a stop; lame" , "Small railway station" , "Pull up" , "game" .)

I've seen this clue in the Evening Standard.

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