Expert opens a new version of Pinafore (5)

I believe the answer is:

apron

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'version of pinafore' is the definition.
'apron' can be an answer for 'pinafore' (I've seen this before). I am unsure of the 'version of' bit.

'expert opens a new' is the wordplay.
'expert' becomes 'pro' (short for professional).
'opens' means one lot of letters goes inside another (one set of letters makes an 'opening' in another).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'a'+'n'='an'
'pro' inserted within 'an' is 'APRON'.

Can you help me to learn more?

(Other definitions for apron that I've seen before include "Cook's protector" , "Type of stage; pinny" , "Pinny -part of the fairway leading onto the green" , "edge" , "Projecting stage" .)

I've seen this clue in The Times.

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