Crossword Genius

Seeing union's leader boarding streetcar, a shock (6)

Ross

I believe the answer is:

trauma

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

'shock' is the definition.
(I've seen this before)

'seeing union's leader boarding streetcar a' is the wordplay.
'seeing union's leader' becomes 'u' (I can't justify this - if you can you should give a lot more credence to this answer).
'boarding' is an insertion indicator.
'streetcar' becomes 'tram' (synonyms).
'u' going inside 'tram' is 'traum'.
'traum'+'a'='TRAUMA'

Can you help me to learn more?

(Other definitions for trauma that I've seen before include "Severe shock, injury" , "Lasting shock or disturbance" , "Emotional damage" , "dreadful shock!" , "Physical or mental shock" .)

I've seen this clue in The Telegraph.
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