Birmingham bus hire included unpleasant surprise (6)

I believe the answer is:

ambush

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'unpleasant surprise' is the definition.
'ambush' can be an answer for 'surprise' (a surprise attack). I am not certain of the 'unpleasant' bit.

'birmingham bus hire included' is the wordplay.
'included' indicates a hidden word (I've seen 'includes' mean this).
'AMBUSH' is hidden in the letters of 'birmingham bus hire'.

Can you help me to learn more?

(Other definitions for ambush that I've seen before include "Take by surprise" , "spring a trap" , "Attack from concealment" , "Await and intercept unexpectedly" , "Lie in wait; trap" .)

I've seen this clue in the Sydney Morning Herald.

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