For protection, cover a piano right over! (5)

I believe the answer is:

apron

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'for protection' is the definition.
(protective garment)

'cover a piano right over' is the wordplay.
'cover' means to remove the middle letters (I've seen 'covers of' mean this).
'a' becomes 'amp' (A is the symbol for the amp or ampere).
'piano right' becomes 'r' (common abbreviation. I am not sure about the 'piano' bit.).
'over' becomes 'on' (physically on top of).
'amp' with its middle removed is 'ap'.
'ap'+'r'+'on'='APRON'

Can you help me to learn more?

(Other definitions for apron that I've seen before include "Protective garment in kitchen" , "Type of stage; pinny" , "Cook's garment" , "Part of stage in front of the curtain" , "Protective cover" .)

I've seen this clue in the Evening Standard.

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