Valued with unusual pride when about middle sized (6)

I believe the answer is:

prized

'valued' is the definition.
('prize' can be a synonym of 'value')

'unusual pride when about middle sized' is the wordplay.
'unusual' indicates anagramming the letters.
'when about' is an insertion indicator.
'middle' indicates the central letters.
The middle of 'sized' is 'z'.
'pride' is an anagram of 'pried'.
'pried' placed around 'z' is 'PRIZED'.

'with' acts as a link.

(Another definition for prized that I've seen is " Cherished".)

I've seen this clue in the Evening Standard.

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