Workwear article that covers behind (5)

I believe the answer is:

apron

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'workwear' is the definition.
I can't tell whether this defines the answer.

'article that covers behind' is the wordplay.
'article' becomes 'an' (English indefinite article).
'that covers' indicates putting letters inside.
'behind' becomes 'pro' (to be pro something is to be behind it).
'an' going around 'pro' is 'APRON'.

Can you help me to learn more?

(Other definitions for apron that I've seen before include "something befitting kitchen-sink drama?" , "Garment for protection" , "Domestic protection" , "Airport area for manoeuvring and loading planes" , "item of protective clothing" .)

I've seen this clue in The Times.

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