Diminish value of child-bearing (6)

I believe the answer is:

impair

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'diminish value' is the definition.
'impair' can be an answer for 'diminish' (I've seen this in another clue). I'm not certain of the 'value' bit.

'child-bearing' is the wordplay.
'child' becomes 'imp' (imp is a kind of child).
'bearing' becomes 'air' (both can mean an attitude or pose).
'imp'+'air'='IMPAIR'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for impair that I've seen before include "'Mar, spoil (6)'" , "Spoil, degrade" , "Hurt or handicap" , "Make worse or less effective" , "Weaken, damage" .)

I've seen this clue in The Globe and Mail.

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