Bigger hospital getting heart bypass? (7)

I believe the answer is:

orbital

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

'bigger hospital getting heart' is the wordplay.
'bigger hospital' becomes 'orbita' (I am not sure about this - if you are sure you should believe this answer much more).
'getting' becomes 'polling' (polling is a kind of getting).
'heart' says to take the centre.
The middle letter of 'polling' is 'l'.
'orbita'+'l'='ORBITAL'

Can you help me to learn more?

(Other definitions for orbital that I've seen before include "Going round - the M25?" , "kind of motorway" , "Of a planetary path" , "going round the city" , "The M 25, say" .)

I've seen this clue in The Guardian.

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