Contend encyclopedia contains bias (8)

I believe the answer is:

tendency

'bias' is the definition.
(thesaurus)

'contend encyclopedia contains' is the wordplay.
'contains' says the answer is hidden in the clue.
'TENDENCY' can be found hidden inside 'contend encyclopedia'.

(Other definitions for tendency that I've seen before include "Inclination or trend" , "'Inclination, propensity (8)'" , "'Inclination, disposition (8)'" , "movement" , "Predisposition" .)

I've seen this clue in The Telegraph.

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