A pair on part of airfield (5)

I believe the answer is:

apron

'part of airfield' is the definition.
('apron' is part of 'airfield')

'a pair on' is the wordplay.
'pair' becomes 'pr'.
'a'+'pr'+'on'='APRON'

(Other definitions for apron that I've seen before include "Protective garment - type of stage" , "skirt" , "Pinny -part of the fairway leading onto the green" , "stage perhaps" , "Paved area where aircraft are parked" .)

I've seen this clue in The Telegraph.

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