Trauma centre surrounded by bigwigs - the snakes! (6)
I believe the answer is:
vipers
'snakes' is the definition.
(viper is a kind of snake)
'trauma centre surrounded by bigwigs' is the wordplay.
'trauma centre' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'surrounded by' is an insertion indicator.
'bigwigs' becomes 'vips' (I've seen this in another clue).
'er' inserted within 'vips' is 'VIPERS'.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for vipers that I've seen before include "21 [SNAKES]" , "Snakes, perhaps in bosoms" , "Venomous snakes" .)