Transport services to Beachy Head (5)

I believe the answer is:

buses

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'transport' is the definition.
(buses are public transport)

'services to beachy head' is the wordplay.
'services' becomes 'bus services' (bus service is a kind of service).
'to beachy head' becomes 'es' (I am not sure about this - if you are sure you should believe this answer much more).
'bus'+'es'='BUSES'

Can you help me to learn more?

(Other definitions for buses that I've seen before include "Public service vehicles" , "Passenger vehicles" , "Public transport vehicles" .)

I've seen this clue in the Evening Standard.

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