Press a curtain material (4)

I believe the answer is:

iron

This clue is a double definition.

'press' is the first definition.
(I know that iron is a more specific form of the action press)

'a curtain material' is the second definition.
(I've seen this in another clue)

(Other definitions for iron that I've seen before include "Heavy metallic element" , "Hard metal" , "Smoother - metal" , "Metal obtained from haematite" , "Decrease" .)

I've seen this clue in The Irish Independent and The Globe and Mail.

Want a hint initially instead of a full solution? Install my app