Crossword Genius

Mass demand for protective covering (4)

Ross

I believe the answer is:

mask

'protective covering' is the definition.
(mask is a kind of protective covering)

'mass demand' is the wordplay.
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'demand' becomes 'ask' (synonyms).
'm'+'ask'='MASK'

'for' acts as a link.

(Other definitions for mask that I've seen before include "Cover for the face" , "Domino" , "cloak" , "Conceal" , "Face covering; disguise" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app