Well fixed, like some hinges (6-6)

I believe the answer is:

spring-loaded

'like some hinges' is the definition.
(spring-loaded hinge is a type of hinge)

'well fixed' is the wordplay.
'well' becomes 'spring' (I've seen this before).
'fixed' becomes 'loaded' (both can mean biased or rigged).
'spring'+'loaded'='SPRING-LOADED'

I've seen this clue in The Times.

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