Polish damage metal flyer (4,6)

I believe the answer is:

sand martin

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

'polish damage metal' is the wordplay.
'polish' becomes 'sand' (to polish or sand down).
'damage' becomes 'mar' (to mar is to spoil or damage).
'metal' becomes 'tin' (tin is a kind of metal).
'sand'+'mar'+'tin'='SAND-MARTIN'

(Other definitions for sand martin that I've seen before include "Migratory bird" , "Singer" , "Flyer" .)

I've seen this clue in The Everyman puzzle in The Observer.

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