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Explanation needed for 5A please.....
Favouritism twice involving head of agency (4)
The answer is 'bias '(= favouritism)
bi for twice?
a (head of'agency')
then where does the 's' come from'?

http://www.thefreedictionary.com/bis

Thank you, claxby.
I'd never heard the term 'bis' - so would never have got that !

Biscuit (twice baked) :)