The outer part. (See above) (5)

I believe the answer is:

cover

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'the outer part' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'see above' is the wordplay.
'see' becomes 'c' (the word for the letter, according to Chambers).
'above' becomes 'over' (I've seen this before).
'c'+'over'='COVER'

Can you help me to learn more?

(Other definitions for cover that I've seen before include "Protect - insure" , "Shroud" , "Overlay" , "Encompass" , "Enshroud" .)

I've seen this clue in the Evening Standard.

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