What could make Heather get undressed in an airfield? (7,5)

I believe the answer is:

landing strip

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'airfield?' is the definition.
(landing strip is a kind of airfield)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for landing strip that I've seen before include "Small airfield" , "down-to-earth way?" , "Area used by light aircraft" , "Where fighter comes in" , "fly from here" .)

I've seen this clue in The Independent.

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