Averagely located in semi-darkness (3)

I believe the answer is:

mid

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

'in semi-darkness' is the wordplay.
'in' says the answer is hidden in the clue.
'MID' is hidden in the letters of 'semi darkness'.

Can you help me to learn more?

(Other definitions for mid that I've seen before include "Prefix meaning centre" , "Dim sort of prefix" , "Of the central part" , "Denote the centre point" .)

I've seen this clue in the Evening Standard.

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