Special covering for wheat (5)

I believe the answer is:

spelt

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'for wheat' is the definition.
(spelt is a kind of wheat)

'special covering' is the wordplay.
'special' becomes 'sp' (abbreviation).
'covering' becomes 'elt' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sp'+'elt'='SPELT'

Can you help me to learn more?

(Other definitions for spelt that I've seen before include "Inferior species of wheat" , "grain" , "Kind of wheat" , "cereal" , "Made up a word" .)

I've seen this clue in The Independent.

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