Service pneumatic drive (3,5)

I believe the answer is:

air force

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'service' is the definition.
(air force is a kind of service)

'pneumatic drive' is the wordplay.
'pneumatic' becomes 'air' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'drive' becomes 'force' (synonyms).
'air'+'force'='AIR FORCE'

Can you help me to learn more?

(Other definitions for air force that I've seen before include "Country's military planes" , "Simple tune for church service" , "A country's flying service" , "Armed service" , "Kind of blue" .)

I've seen this clue in The Hindu.

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